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

https://github.com/pbui/void-packages polybar
https://github.com/void-linux/void-packages/pull/27144

polybar: update to 3.5.2.
Remove unneeded post_extract (tested cross-build).

A patch file from https://github.com/void-linux/void-packages/pull/27144.patch is attached