Merge commit 'ac7bfd69678f3966e38debdb27f4bde94dc0345c'

* commit 'ac7bfd69678f3966e38debdb27f4bde94dc0345c':
  lavfi: add a QSV scaling filter

This is a noop since it depends on sharing a hwcontext with the
decoder/encoder, see 04b17ff and 130e1f1

Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>