mingw: add workaround for _ftime_s issue on mingw
mingw: add workaround for _ftime_s issue on mingw

mingw has a _ftime_s prototype in its headers, but no corresponding
symbol available at link time. Workaround this issue for now by
 #defining it to _ftime. This is untested on win64 where the workaround
may not be needed.

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