[FFmpeg-devel] [PATCH] Port gradfun to libavfilter (GCI)

[Nolan L]

As part of a GCI task, I've ported the gradfun debanding filter from mplayer
to libavfilter.

The patch includes changes to the build system to account for CPU
optimizations that weren't present previously.

There is a SSE2 method that remains unported due to lack of SSE2 detection
in the configure script that I wasn't quite sure how to add.
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