Merge commit 'ddea22a684611c1fec9d8b5c70d835e983a9252e'

* commit 'ddea22a684611c1fec9d8b5c70d835e983a9252e':
  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
24cc0a53e99e281b0ff502e82e7cf857111eca3f
758fbc54fef2f31957b5c5f22e05e5fd9b04f631
9f00fa536938130e3c7ad2640a61795770d419a1
67e81d79ccfc6713c797ddb19a3b8aea476c947b
3536a3efb9fde88d34d526a51b1080247326cd6e
9bd326ac465db2eee47301a1225d55dffd7bfe93
da4e02b1961572c15d7cd6a701d153155f196477
3a71bcc213f223428622ac3750fe1a923f2f3ab4
b0cd14fb1dab4b044f7fe6b53ac635409849de77

Merged-by: James Almer <jamrial@gmail.com>