James Zern d167a1aeee vp9_thread: prefer pthread.h if available
this avoids conflicts with recent versions of mingw-w64 (tested g++
4.8.2) and the unit tests

Change-Id: Ic41ea31eebe0e3e712ed5e657f37d8cad6712088
2015-02-10 12:47:14 -08:00
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