[FFmpeg-cvslog] w32pthreads: fix mingw build on x86 with -msse2 or higher

ffmpeg | branch: master | Hendrik Leppkes | Wed Oct 14 23:20:09 2015 +0200| [97be5d4d200755c5077684e6ea003d3c452b0b4a] | committer: Hendrik Leppkes w32pthreads: fix mingw build on x86 with -msse2 or higher When SSE2 or higher compiler optimizations are used, mingw uses the _mm_mfence intrinsic

[FFmpeg-cvslog] w32pthreads: fix mingw build on x86 with -msse2 or higher

ffmpeg | branch: master | Hendrik Leppkes | Wed Oct 14 23:18:17 2015 +0200| [68e00ad66d13c57d9eb3a3862b44ab3fb030e19f] | committer: Luca Barbato w32pthreads: fix mingw build on x86 with -msse2 or higher When SSE2 or higher compiler optimizations are used, mingw uses the _mm_mfence intrinsic fo