Fix MinGW build to use Pthread when the header is available. Some MinGW configurations use WinPThread instead of the native threading interfaces. When this happens libc++ doesn't build because it tries to use the wrong threading API. This patch attempts to correctly detect and enable pthreads; Selecting them when __MINGW32__ is defined and __has_include(<pthread.h>) is true. I'm not sure if this works correctly 100% of the time but it seemed like the most correct approach available. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@302734 91177308-0d34-0410-b5e6-96231b3b80d8
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