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

https://github.com/zdykstra/void-packages wayvnc
https://github.com/void-linux/void-packages/pull/23884

wayvnc and supporting libraries
Tested locally on ppc64le with Remmina - works like a charm.

A patch file from https://github.com/void-linux/void-packages/pull/23884.patch is attached