Merge commit '757d85868b77c4fdec7b77a3b7de1faf16c031e8'

* commit '757d85868b77c4fdec7b77a3b7de1faf16c031e8':
  vdpau: fix obsolete mpeg1 vdpau decoder when mpeg2 is disabled

Conflicts:
	libavcodec/mpeg12.c

Nothing changes as the buggy code is not in ffmpeg

Merged-by: Michael Niedermayer <michaelni@gmx.at>