[phobos] install targets

[Brad Roberts]

Ok.. I've just submitted pull requests for dmd, druntime, and phobos to 
add install targets that build a sibling directory with the output of 
the build process for each of those packages.  There's missing pieces: 
documentation and tools in particular.  Those can come later.

I've only tested this on linux so far, but it seems to do the trick:

$ mkdir test-dir
$ cd test-dir
$ for x in dmd druntime phobos; do
     git clone https://github.com/braddr/$x -b install
   done
$ cd dmd
$ make -f posix.mak MODEL=32 install
$ cd ../druntime
$ make -f posix.mak MODEL=32 DMD=../install/bin/dmd install
$ cd ../phobos
$ make -f posix.mak MODEL=32 DMD=../install/bin/dmd install
$ cd ../install
$ find . -type f | sort
./bin/dmd
./bin/dmd.conf
./dmd-artistic.txt
./dmd-backendlicense.txt
./druntime-LICENSE.txt
./html/core_atomic.html
./html/core_bitop.html
./html/core_cpuid.html
./html/core_demangle.html
./html/core_exception.html
./html/core_math.html
./html/core_memory.html
./html/core_runtime.html
./html/core_simd.html
./html/core_sync_barrier.html
./html/core_sync_condition.html
./html/core_sync_config.html
./html/core_sync_exception.html
./html/core_sync_mutex.html
./html/core_sync_rwmutex.html
./html/core_sync_semaphore.html
./html/core_thread.html
./html/core_time.html
./html/core_vararg.html
./html/object.html
./import/core/atomic.d
./import/core/bitop.d
./import/core/cpuid.d
./import/core/demangle.d
./import/core/exception.d
./import/core/math.d
./import/core/memory.d
./import/core/runtime.d
./import/core/simd.d
./import/core/stdc/complex.d
./import/core/stdc/config.d
./import/core/stdc/ctype.d
./import/core/stdc/errno.d
./import/core/stdc/fenv.d
./import/core/stdc/float_.d
./import/core/stdc/inttypes.d
./import/core/stdc/limits.d
./import/core/stdc/locale.d
./import/core/stdc/math.d
./import/core/stdc/signal.d
./import/core/stdc/stdarg.d
./import/core/stdc/stddef.d
./import/core/stdc/stdint.d
./import/core/stdc/stdio.d
./import/core/stdc/stdlib.d
./import/core/stdc/string.d
./import/core/stdc/tgmath.d
./import/core/stdc/time.d
./import/core/stdc/wchar_.d
./import/core/stdc/wctype.d
./import/core/sync/barrier.di
./import/core/sync/condition.di
./import/core/sync/config.di
./import/core/sync/exception.di
./import/core/sync/mutex.di
./import/core/sync/rwmutex.di
./import/core/sync/semaphore.di
./import/core/sys/freebsd/dlfcn.d
./import/core/sys/freebsd/execinfo.d
./import/core/sys/freebsd/sys/event.d
./import/core/sys/linux/config.d
./import/core/sys/linux/dlfcn.d
./import/core/sys/linux/elf.d
./import/core/sys/linux/epoll.d
./import/core/sys/linux/errno.d
./import/core/sys/linux/execinfo.d
./import/core/sys/linux/link.d
./import/core/sys/linux/sys/signalfd.d
./import/core/sys/linux/sys/xattr.d
./import/core/sys/osx/execinfo.d
./import/core/sys/osx/mach/kern_return.d
./import/core/sys/osx/mach/port.d
./import/core/sys/osx/mach/semaphore.d
./import/core/sys/osx/mach/thread_act.d
./import/core/sys/osx/pthread.d
./import/core/sys/posix/arpa/inet.d
./import/core/sys/posix/config.d
./import/core/sys/posix/dirent.d
./import/core/sys/posix/dlfcn.d
./import/core/sys/posix/fcntl.d
./import/core/sys/posix/grp.d
./import/core/sys/posix/inttypes.d
./import/core/sys/posix/netdb.d
./import/core/sys/posix/net/if_.d
./import/core/sys/posix/netinet/in_.d
./import/core/sys/posix/netinet/tcp.d
./import/core/sys/posix/poll.d
./import/core/sys/posix/pthread.d
./import/core/sys/posix/pwd.d
./import/core/sys/posix/sched.d
./import/core/sys/posix/semaphore.d
./import/core/sys/posix/setjmp.d
./import/core/sys/posix/signal.d
./import/core/sys/posix/stdio.d
./import/core/sys/posix/stdlib.d
./import/core/sys/posix/sys/ioctl.d
./import/core/sys/posix/sys/ipc.d
./import/core/sys/posix/sys/mman.d
./import/core/sys/posix/sys/resource.d
./import/core/sys/posix/sys/select.d
./import/core/sys/posix/sys/shm.d
./import/core/sys/posix/sys/socket.d
./import/core/sys/posix/sys/stat.d
./import/core/sys/posix/sys/statvfs.d
./import/core/sys/posix/sys/time.d
./import/core/sys/posix/sys/types.d
./import/core/sys/posix/sys/uio.d
./import/core/sys/posix/sys/un.d
./import/core/sys/posix/sys/utsname.d
./import/core/sys/posix/sys/wait.d
./import/core/sys/posix/termios.d
./import/core/sys/posix/time.d
./import/core/sys/posix/ucontext.d
./import/core/sys/posix/unistd.d
./import/core/sys/posix/utime.d
./import/core/sys/windows/dbghelp.d
./import/core/sys/windows/dll.d
./import/core/sys/windows/stacktrace.d
./import/core/sys/windows/threadaux.d
./import/core/sys/windows/windows.d
./import/core/thread.di
./import/core/time.d
./import/core/vararg.d
./import/crc32.d
./import/etc/c/curl.d
./import/etc/c/.curl.d.swp
./import/etc/c/sqlite3.d
./import/etc/curl.d
./import/etc/c/zlib/adler32.c
./import/etc/c/zlib/algorithm.txt
./import/etc/c/zlib/ChangeLog
./import/etc/c/zlib/compress.c
./import/etc/c/zlib/crc32.c
./import/etc/c/zlib/crc32.h
./import/etc/c/zlib.d
./import/etc/c/zlib/deflate.c
./import/etc/c/zlib/deflate.h
./import/etc/c/zlib/example.c
./import/etc/c/zlib/gzclose.c
./import/etc/c/zlib/gzguts.h
./import/etc/c/zlib/gzlib.c
./import/etc/c/zlib/gzread.c
./import/etc/c/zlib/gzwrite.c
./import/etc/c/zlib/infback.c
./import/etc/c/zlib/inffast.c
./import/etc/c/zlib/inffast.h
./import/etc/c/zlib/inffixed.h
./import/etc/c/zlib/inflate.c
./import/etc/c/zlib/inflate.h
./import/etc/c/zlib/inftrees.c
./import/etc/c/zlib/inftrees.h
./import/etc/c/zlib/linux.mak
./import/etc/c/zlib/minigzip.c
./import/etc/c/zlib/osx.mak
./import/etc/c/zlib/README
./import/etc/c/zlib/trees.c
./import/etc/c/zlib/trees.h
./import/etc/c/zlib/uncompr.c
./import/etc/c/zlib/win32.mak
./import/etc/c/zlib/win64.mak
./import/etc/c/zlib/zconf.h
./import/etc/c/zlib/zlib.3
./import/etc/c/zlib/zlib.h
./import/etc/c/zlib/zutil.c
./import/etc/c/zlib/zutil.h
./import/etc/linux/memoryerror.d
./import/object.di
./import/std/algorithm.d
./import/std/array.d
./import/std/ascii.d
./import/std/aws.d
./import/std/base64.d
./import/std/bigint.d
./import/std/bitmanip.d
./import/std/c/fenv.d
./import/std/c/freebsd/socket.d
./import/std/c/linux/linux.d
./import/std/c/linux/linuxextern.d
./import/std/c/linux/pthread.d
./import/std/c/linux/socket.d
./import/std/c/linux/termios.d
./import/std/c/linux/tipc.d
./import/std/c/locale.d
./import/std/c/math.d
./import/std/compiler.d
./import/std/complex.d
./import/std/concurrency.d
./import/std/container.d
./import/std/conv.d
./import/std/c/osx/socket.d
./import/std/c/process.d
./import/std/c/stdarg.d
./import/std/c/stddef.d
./import/std/c/stdio.d
./import/std/c/stdlib.d
./import/std/cstream.d
./import/std/c/string.d
./import/std/csv.d
./import/std/c/time.d
./import/std/c/wcharh.d
./import/std/c/windows/com.d
./import/std/c/windows/stat.d
./import/std/c/windows/windows.d
./import/std/c/windows/winsock.d
./import/std/datetime.d
./import/std/demangle.d
./import/std/digest/crc.d
./import/std/digest/digest.d
./import/std/digest/md.d
./import/std/digest/ripemd.d
./import/std/digest/sha.d
./import/std/encoding.d
./import/std/exception.d
./import/std/file.d
./import/std/format.d
./import/std/functional.d
./import/std/getopt.d
./import/std/internal/digest/sha_SSSE3.d
./import/std/internal/math/biguintcore.d
./import/std/internal/math/biguintnoasm.d
./import/std/internal/math/biguintx86.d
./import/std/internal/math/errorfunction.d
./import/std/internal/math/gammafunction.d
./import/std/internal/processinit.d
./import/std/internal/uni.d
./import/std/internal/uni_tab.d
./import/std/internal/windows/advapi32.d
./import/std/json.d
./import/std/math.d
./import/std/mathspecial.d
./import/std/md5.d
./import/std/metastrings.d
./import/std/mmfile.d
./import/std/net/curl.d
./import/std/net/isemail.d
./import/std/numeric.d
./import/std/outbuffer.d
./import/std/parallelism.d
./import/std/path.d
./import/std/process.d
./import/std/random.d
./import/std/range.d
./import/std/regex.d
./import/std/signals.d
./import/std/socket.d
./import/std/socketstream.d
./import/std/stdint.d
./import/std/stdiobase.d
./import/std/stdio.d
./import/std/stream.d
./import/std/string.d
./import/std/syserror.d
./import/std/system.d
./import/std/traits.d
./import/std/typecons.d
./import/std/typelist.d
./import/std/typetuple.d
./import/std/uni.d
./import/std/uri.d
./import/std/utf.d
./import/std/uuid.d
./import/std/variant.d
./import/std/windows/charset.d
./import/std/windows/iunknown.d
./import/std/windows/registry.d
./import/std/windows/syserror.d
./import/std/xml.d
./import/std/zip.d
./import/std/zlib.d
./lib/libdruntime-linux32.a
./lib/libdruntime-linux32so.a
./lib/libdruntime-linux32so.o
./lib/libphobos2.a
./man/man1/dmd.1
./man/man1/dmd.conf.5
./man/man1/dumpobj.1
./man/man1/obj2asm.1
./man/man1/rdmd.1
./phobos-LICENSE.txt
./samples/all.sh
./samples/build.bat
./samples/chello.d
./samples/clean.bat
./samples/d2html.d
./samples/d2html.kwd
./samples/dclient.d
./samples/dhry.d
./samples/dserver.d
./samples/dserver.def
./samples/hello.d
./samples/htmlget.d
./samples/listener.d
./samples/mydll/build.bat
./samples/mydll/dll.d
./samples/mydll/mydll.d
./samples/mydll/mydll.def
./samples/mydll/mydll.di
./samples/mydll/test.d
./samples/pi.d
./samples/sieve.d
./samples/wc2.d
./samples/wc.d
./samples/winsamp.d
./samples/winsamp.def