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

xonotic: update to 0.8.6
https://github.com/void-linux/void-packages/pull/44575

Description:
#### Testing the changes
- I tested the changes in this PR: **briefly** (played some 30 seconds from singleplayer mode)

#### Local build testing
- I built this PR locally for my native architecture, x86_64-glibc