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

https://github.com/the-maldridge/void-packages remove-obsoletes
https://github.com/void-linux/void-packages/pull/30147

xbps-src: Add remove-obsoletes command
This cleans more than it probably should since it will clean several layers of nesting.  We could enable globstar and iterate over everything it finds, but I'm not particularly keen on this.

Open to changes on this, looking for feedback.

A patch file from https://github.com/void-linux/void-packages/pull/30147.patch is attached