Merge commit '4795e4f6'

* commit '4795e4f6':
  alac: Convert to the new bitstream reader
  rtp: Convert to the new bitstream reader
  mov: Convert to the new bitstream reader

This merge is a noop, see
http://ffmpeg.org/pipermail/ffmpeg-devel/2017-April/209609.htmlMerged-by: Clément Bœsch <u@pkh.me>