Merge commit '3178f4d3'

* commit '3178f4d3':
  h264: move rbsp_buffer into the per-slice context

Conflicts:
	libavcodec/h264.c
	libavcodec/h264_parser.c
	libavcodec/h264_slice.c

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