Merge commit '381a4e31'

* commit '381a4e31':
  tak: Convert to the new bitstream reader
  magicyuv: Convert to the new bitstream reader
  truemotion2rt: Convert to the new bitstream reader
  wavpack: Convert to the new bitstream reader
  mpc: 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>