gold work on mingw/mingw64 support

[Vladimir Simonov]

Hi,

Attaching the patch which allows to build gold working
in mingw/mingw64 environment.

The patch's idea is to provide restricted emulation for
Linux-specific calls, like mremap, mremap, etc. And force
callers always to keep files in-memory.

Yes, this approach is a bit memory consuming but
IMO it is not a problem, especially for mingw64.
Really, for 32-bit Windows cygwin-based gold may be used.

It is a port of my patch against binutils 2.20.1 and
it was not tested deep. Original patch works
quite well - I saw only debug-info messing in very
large programs.

What do you think about this approach and the patch itself?

Thanks in advance
Vladimir Simonov

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