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

lilypond: update to 2.21.7
https://github.com/void-linux/void-packages/pull/23531

Description:
(obsolete: Tested 2.21.2 on x86_64, x86_64-musl, i686 and armv7l.)
Tested 2.21.3 on x86_64-musl.