There is a new pull request by Logarithmus against master on the void-packages repository

https://github.com/Logarithmus/void-packages musl-locales
https://github.com/void-linux/void-packages/pull/26142

New package: musl-locales-0.git20201006
Partial locale support for `musl`
Homepage: https://gitlab.com/rilian-la-te/musl-locales

A patch file from https://github.com/void-linux/void-packages/pull/26142.patch is attached