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

https://github.com/ndowens/void-packages libunwind
https://github.com/void-linux/void-packages/pull/26338

libunwind: update to 1.5.0
aarch64-musl patch was integrated upstream

A patch file from https://github.com/void-linux/void-packages/pull/26338.patch is attached