[PRQ#49295] Merge Request for qt-avif-image-plugin-libavif-git

MarsSeed [1] filed a request to merge qt-avif-image-plugin-libavif-git [2] into qt5-avif-image-plugin-git [3]: Eliminating duplication; also 'qt5-avif-image-plugin-git' has the more appropriate name and is packaged better. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/qt-avif-image-plugin-libavif-git/ [3] https://aur.archlinux.org/pkgbase/qt5-avif-image-plugin-git/