[PATCH] win64 support for libffi (2/2)

[Timothy Wall]

Here's the patch for the libffi testsuite (against gcc/libffi).

This patch uses ffi_closure_alloc instead of inline mmap checking.
It also uses intptr_t in place of long casts.
It marks long double tests as XFAIL for x86_64-*-mingw|cygwin.

This is the 1/2 part of the patch that doesn't seem to be getting to  
gcc-patches.

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