There's a merged pull request on the void-packages repository

libavif: fix usage of system codecs.
https://github.com/void-linux/void-packages/pull/52270

Description:
The options to enable additional codecs require either LOCAL for the vendored copy, or SYSTEM for the system libraries. Our version of libavif was getting built without any support for dav1d, rav1e or svt.

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Noticed this when running `xbps-remove -o`.

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#### Testing the changes
- I tested the changes in this PR: **YES** (only at build time, and it does add the dependencies which were previously missing)