There is an updated pull request by mamins1376 against master on the void-packages repository

https://github.com/mamins1376/void-packages new/wammu
https://github.com/void-linux/void-packages/pull/14628

New package: wammu-0.44
This package needed `python-gammu`, so that was also included in it's own commit.

A patch file from https://github.com/void-linux/void-packages/pull/14628.patch is attached