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

https://github.com/ericonr/void-packages s6
https://github.com/void-linux/void-packages/pull/24406

s6-networking: add bearssl option, add devel deps.
s6-networking can also be built with BearSSL support, with full
functionality. The devel package for the chosen SSL library and
skalibs-devel are necessary for development with s6-networking
libraries, so they have been added as dependencies to the
s6-networking-devel.

Also xlint.

A patch file from https://github.com/void-linux/void-packages/pull/24406.patch is attached