There is an updated pull request by newbluemoon against master on the void-packages repository

https://github.com/newbluemoon/void-packages lilypond
https://github.com/void-linux/void-packages/pull/26097

[wip] lilypond: update to 2.21.80


A patch file from https://github.com/void-linux/void-packages/pull/26097.patch is attached