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

https://github.com/mtboehlke/void-packages libopenal
https://github.com/void-linux/void-packages/pull/35594

libopenal: update to 1.21.1 and import fixes to sndio backend
Patches to fix the issue reported at https://github.com/kcat/openal-soft/issues/591

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I encountered the problem described in the linked issue when playing around with wildmidi.  I was hoping to have wildmidi use sndio by compiling without direct alsa support, and then rely on libopenal to use sndio.  When libopenal was configured for sndio, playback stopped immediately with the error message: `[ALSOFT] (EE) Error stopping device`.  Playback worked as expected with sndio after including these upstream patches.

A patch file from https://github.com/void-linux/void-packages/pull/35594.patch is attached