[Bug libstdc++/67114] [MinGW64] build failure with POSIX threads enabled

[ralphengels at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67114

ralphengels at gmail dot com <ralphengels at gmail dot com> changed:

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--- Comment #12 from ralphengels at gmail dot com <ralphengels at gmail dot com> ---
Created attachment 38009
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38009&action=edit
pthreads-w32 compatibility patch

Patch to allow building gcc-5.3.0 with pthreads-w32, no bugs so far but im
still running the testsuite so something might turn up, feel free to test.