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

https://github.com/AluminumTank/void-packages nginx
https://github.com/void-linux/void-packages/pull/27662

nginx: build with http_slice_module
Add support for slicing. Runtime tested on my server, and builds for armv7l as well.

A patch file from https://github.com/void-linux/void-packages/pull/27662.patch is attached