There is an updated pull request by st3r4g against master on the void-packages repository

https://github.com/st3r4g/void-packages mesa-20.1.9
https://github.com/void-linux/void-packages/pull/25219

mesa: update to 20.1.9
Tested GL app (kitty) and VK app (vkcube) under sway on x86_64-musl

A patch file from https://github.com/void-linux/void-packages/pull/25219.patch is attached