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

libopenal: update to 1.21.1 and import fixes to sndio backend
https://github.com/void-linux/void-packages/pull/35594

Description:
Patches to fix the issue reported at https://github.com/kcat/openal-soft/issues/591

<!-- Uncomment relevant sections and delete options which are not applicable -->

#### Testing the changes
- I tested the changes in this PR: **briefly**

<!--
#### New package
- This new package conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements): **YES**|**NO**
-->

<!-- Note: If the build is likely to take more than 2 hours, please [skip CI](https://github.com/void-linux/void-packages/blob/master/CONTRIBUTING.md#continuous-integration)
and test at least one native build and, if supported, at least one cross build.
Ignore this section if this PR is not skipping CI.
-->
<!-- 
#### Local build testing
- I built this PR locally for my native architecture, (ARCH-LIBC)
- I built this PR locally for these architectures (if supported. mark crossbuilds):
  - aarch64-musl
  - armv7l
  - armv6l-musl
-->
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.