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

https://github.com/ahesford/void-packages avahi
https://github.com/void-linux/void-packages/pull/21731

Update avahi, take ownership
This brings avahi and its subpackages up to date. Included are new libraries to incorporate avahi with libevent or qt5, as new subpackages. Also, the Python parts of avahi are compatible with py3, so there are new `-python3` subpackages as appropriate. The `avahi-python` package is still usable with py2 and has been preserved; `avahi-python-utils` is now an empty meta to bring in the new `avahi-python3-utils`, as the contents of the newer package supplant the older.

A patch file from https://github.com/void-linux/void-packages/pull/21731.patch is attached