Remove custom code needed in the past in order to successfully link ffmpeg library.
update CFLAGS and ffmpeg/config.asm and ffmpeg/config.h
update ffmpeg (n0.8-19710-g35135a3)
update h264_recov.c for the recent changes
Update our files for the recent FFmpeg changes.
H264 DXVA Decoder: Rewrote h264_dxva.c based on recent h264.c.