Win64 fix for missing _isnanf #1126
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Per discussion in #1108, mingw64 seems to erroneously add an underscore to
isnanffunction calls. This fix prevents a crash ofunimplemented function msvcrt.dll._isnanfwhen running the 64-bit build in Wine.This potential bug was discovered while troubleshooting a win64 crash with vesa's new
memmgrbranch slated for the 1.2 release.