[PATCH] Fixed compilation on mingw-w64 after recent ABI change.

[Jacek Caban]

Hi,

mingw-w64 ABI has been recently changed to use nonunderscored symbol names 
(for compatibility with MSVC). The attached patch fixes libffi compilation 
with recent mingw-w64. For backward compatibility, I've added a configure 
check for underscored symbols.

Thanks,
     Jacek
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