Attempt to get rid of phobos Makefiles, using reggae

[Atila Neves via Digitalmars-d]

> I read somewhere that reggae builds itself. I'd suggest a way 
> to build reggae with only OS-provided common tools, since you'd 
> have to include it in the toolchain in order to build 
> dmd/phobos otherwise.

It can build itself, yes. Since I've only developed and tested it 
on Linux, the `bootstrap.sh` script in the repo builds it by 
calling dmd on all the sources. After that it can (and does) 
build itself. There'd have to be a .bat for Windows but any other 
POSIX system should be able to call `bootstrap.sh`.

Atila