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

https://github.com/MattTheNub/void-packages mgba-0.8.4
https://github.com/void-linux/void-packages/pull/27450

mgba: update to 0.8.4


A patch file from https://github.com/void-linux/void-packages/pull/27450.patch is attached