Temporary fix for #11159: Fix playback of HD-PVR recording

This revert FFmpeg commit bfca35114ae174bbabd88526379d95d4022a98b1
(ref https://ffmpeg.org/trac/ffmpeg/ticket/2062)
(cherry picked from commit d34833f2eeab06bc17338e4d5a8bc33589f41506)

Conflicts:
	mythtv/external/FFmpeg/libavcodec/h264.c