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

https://github.com/sgn/void-packages masterdir-locale
https://github.com/void-linux/void-packages/pull/23897

xbps-src: enable C.UTF-8 locale on glibc masterdir
`util-linux` requires `C.UTF-8` for testing.

Since this is an important part of system,
enable `C.UTF-8' for checking `util-linux`.

A patch file from https://github.com/void-linux/void-packages/pull/23897.patch is attached