Merge commit '113aeee6aed35cb786a9f6d69b0cb210f498b9da'

Merge commit '113aeee6aed35cb786a9f6d69b0cb210f498b9da'

* commit '113aeee6aed35cb786a9f6d69b0cb210f498b9da':
  h264_parser: move the H264DSPContext to the parser context

H264Context is kept locally as it is currently needed for logging
(h->avctx as log context) and for is_avc and nal_length_size. These
later fields will later be obtained when the extradata parsing is
decoupled from the decoder. This code will be updated accordingly when
that commit is merged.

Merged-by: Clément Bœsch <u@pkh.me>