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

https://github.com/kartikynwa/void-packages retroarch
https://github.com/void-linux/void-packages/pull/15606

retroarch: update to 1.7.9.2
Added qt5 build option. Disabled as of now but feel free to enable it if you want.

A patch file from https://github.com/void-linux/void-packages/pull/15606.patch is attached