h264: move relevant fields from Picture to H264Picture
Merge commit '9b749c8274f6b6f35dde2cf29b99fa4f719abf87'

* commit '9b749c8274f6b6f35dde2cf29b99fa4f719abf87':
  h264: move relevant fields from Picture to H264Picture

Conflicts:
	libavcodec/h264.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/h264: h264_set_erpic() clear destination

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