[PATCH] Fix make closures.c use dlmmap,dlmunmap on cygwin.

[Dave Korn]

[ Re: http://gcc.gnu.org/ml/gcc-patches/2009-06/threads.html#02228 ]

    Hey all,

  Take 2 of this patch.  Works in the simplest way possible, by saying that
cygwin is an exception to the rule about win32/64 platforms not using the
local dlmmap/dlmunmap implementations.

  Sticklers for formatting will note that two of the #endif lines reach 81
characters, because of the comment repeating the #if condition.  I didn't
think it was worth wrapping the lines for such a tiny excess length in
something this trivial, but I'll do so before committing if that's what the
maintainers decide.

libffi/ChangeLog:

	* closures.c (mmap, munmap):  Don't define replacement macros pointing
	to dl* versions on windows platforms.

  Bootstrapping now.  Assuming it completes and libffi tests run alright, OK?

    cheers,
      DaveK
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