lavf: remove disabled FF_API_R_FRAME_RATE cruft
Merge commit '85a5bc054c1290699ccbf5799ba6c4e2fbcc3530'

* commit '85a5bc054c1290699ccbf5799ba6c4e2fbcc3530':
  lavf: remove disabled FF_API_R_FRAME_RATE cruft

Conflicts:
	libavformat/avformat.h
	libavformat/electronicarts.c
	libavformat/rawdec.c
	libavformat/utils.c
	libavformat/version.h

The field is in use and no semantically equivalent field is available,
thus not removed

Merged-by: Michael Niedermayer <michaelni@gmx.at>
avframe: Copy buffer type in copy_props.

Fixes VDPAU decoding with MPlayer.