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

https://github.com/Johnnynator/void-packages wine-musl
https://github.com/void-linux/void-packages/pull/21701

[wip] wine: enable build for x86_64-musl
mpv.exe runs fine

A patch file from https://github.com/void-linux/void-packages/pull/21701.patch is attached