There's a merged pull request on the void-packages repository

mesa: update to 20.1.5.
https://github.com/void-linux/void-packages/pull/24312

Description:
I have briefly tested this on x86_64 and ppc64le, it's a bug fix release so i don't believe any of the patches need to be adjusted. If they do I'll close this and let someone more experienced have a hand at it.