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

https://github.com/Stantheman/void-packages vlc-chromecast-option
https://github.com/void-linux/void-packages/pull/15022

vlc: add chromecast option
Hi, this is adding an option to build VLC with support for chromecasting

A patch file from https://github.com/void-linux/void-packages/pull/15022.patch is attached