[m-rev.] for review: mmakefiles.m

[Zoltan Somogyi]

For review by anyone. The best way to review the meat of the diff,
the change to write_deps_file.m, is by looking at the old and new versions
with diff --side-by-side.

I have tested this in hlc.gc, asm_fast.gc and asm_fast.gc.decldebug grades.
I cannot test it Java or C# grades, since I don't have those installed
on my laptop, so I would request someone who does have them installed
to try them out.

Zoltan.
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