Merge commit '84ab1cc4'

* commit '84ab1cc4':
  movenc: allow alternative hvc1 h.265 codec tag
  movenc: write correct format hvcc when tag is hvc1
  movenc: move tags definitions to where they are used
  movenc: simplify codec_tag lookup
  movenc: use correct tag list for AVOutputFormat.codec_tag
  aarch64: vp9: Fix assembling with Xcode 6.2 and older
  doc: Drop the legacy symlink to README

This commit is a noop, see
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369a3e11Merged-by: NJames Almer <jamrial@gmail.com>