Merge commit 'ddea22a6'

* commit 'ddea22a6':
  avconv: Use codec hardware config to configure hwaccels
  lavc: Mark all AVHWAccel structures as const
  lavc: Delete all fake hwaccels
  lavc: Remove register mechanism for hwaccels
  lavc: Deprecate av_hwaccel_next() and av_register_hwaccel()
  lavc: Use hardware config information in ff_get_format()
  webp: Fix alpha initialisation
  lavc: Add hardware config metadata for decoders supporting hardware output
  lavc: Add codec metadata to indicate hardware support

This commit is a noop, see
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b0cd14fbMerged-by: James Almer <jamrial@gmail.com>