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

https://github.com/wangp/void-packages libva-multilib
https://github.com/void-linux/void-packages/pull/17806

libva: set driver dir to /usr/lib32/dri on i686
If the libva i686 package is installed as a multilib package on x86_64,
it needs to load drivers from /usr/lib32/dri instead of /usr/lib/dri.

A patch file from https://github.com/void-linux/void-packages/pull/17806.patch is attached