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

https://github.com/ericonr/void-packages mesa
https://github.com/void-linux/void-packages/pull/27291

mesa: update to 20.3.1.
- removed drm and surfaceless from platforms since they're determined
automatically now.
- fix driver search path to use /usr/lib${wordsize}; see
https://github.com/void-linux/void-packages/pull/27269
- remove transitional dummy packages that only depend on mesa-dri

Closes: #27214 [via git-merge-pr]

I'm not sure if the issue here https://gitlab.freedesktop.org/mesa/mesa/-/issues/3989 matters for us.

A patch file from https://github.com/void-linux/void-packages/pull/27291.patch is attached