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

https://github.com/ScrelliCopter/void-packages openmpt
https://github.com/void-linux/void-packages/pull/23926

libopenmpt: update to 5.1


A patch file from https://github.com/void-linux/void-packages/pull/23926.patch is attached