a38770bd69
https://github.com/AOMediaCodec/libavif/pull/182 https://github.com/AOMediaCodec/libavif/pull/977 Mostly mirrors webp-pixbuf-loader. Also use prefixed names for `loaders.cache` so that users can install multiple loaders in a profile without collisions, and move `bin/webp-thumbnailer` to `libexec/gdk-pixbuf-thumbnailer-webp` (and similarly for avif).