* [ffmpeg] update to version 4.4

* [ffmpeg] format-manifest

* [ffmpeg] remove avresample as default feature (it is deprecated, not upstream default, and will be removed in 4.5)

* [ffmpeg] x-add-version

* [ffmpeg] add avresample under the all feature

* [ffmpeg] x-add-version

* [ffmpeg] remove unused patch

* [ffmpeg] x-add-version

* [ffmpeg] remove wavpack from FindFFMPEG

* [ffmpeg] x-add-version

* [ffmpeg] fix compile cuda issue

* [ffmpeg] x-add-version

* [ffmpeg] only apply cuda compile patch on windows targets

* [ffmpeg] x-add-version

* [ffmpeg] fix dnn dependency

The source file "libavfilter/dnn/dnn_backend_native.h" includes
"libavformat/avio.h", so avformat needs to be declared as a dependency.
This fixes the build of ffmpeg[core,avfilter]:x64-windows.

Posted upstream here:

http://ffmpeg.org/pipermail/ffmpeg-devel/2021-May/279926.html

Whilst at it, I've also added a link to the other avfilter patch:

http://ffmpeg.org/pipermail/ffmpeg-devel/2021-May/279927.html

* [ffmpeg] version bump

* [ffmpeg] x-add-version

* [openimageio] revert accidentally committed change that is meant for other PR