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

https://github.com/Duncaen/void-packages distfiles-mirror
https://github.com/void-linux/void-packages/pull/38494

xbps-src: clean up fetch hook and allow mirroring
As an alternative to https://github.com/void-linux/void-packages/pull/38438

Allow mirroring by having multiple distfiles for the same target file name, either by url or by ">filename".

A patch file from https://github.com/void-linux/void-packages/pull/38494.patch is attached