graphics/kf5-kimageformats: backports to fix animated AVIF performance
Upstream:
https://invent.kde.org/frameworks/kimageformats/-/commit/350ce1b990460cb2178f369f22fe80803f5645f3
https://invent.kde.org/frameworks/kimageformats/-/commit/1190e53e9b69da6f9663ceb75c4813c5708b7cbd
These commits fix a significant performance issue experienced when using
animated AVIF images.
Reported by: Nate Graham <nate@kde.org>