[dmd-internals] 3.5x speedup in building dmd

[Andrei Alexandrescu]

Running

make -f linux.mak

against the original makefile takes 3:27 on my machine. I tried this to 
speed up building by running 4 processes at once:

make -f linux.mak -j 4

However, there are errors because the makefile does not establish 
dependencies properly.

The attached makefile fixes that problem. With the changed makefile, the 
build time falls to 0:52 on my machine - a more than 3.5x speedup.

Walter, could you please check this in? Thanks!


Andrei
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