There is an updated pull request by 4ricci against master on the void-packages repository

https://github.com/4ricci/void-packages fluidsynth-2.1.6
https://github.com/void-linux/void-packages/pull/27758

fluidsynth: update to 2.1.6


A patch file from https://github.com/void-linux/void-packages/pull/27758.patch is attached