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

https://github.com/seisatsu/void-packages mcomix-pil-patch
https://github.com/void-linux/void-packages/pull/13148

Fix #13143 by patching MComix for PIL-6.0.0 compat.
Fixes the incompatibility issue between MComix and Python-Pillow-6.0.0 described in issue #13143 using patches found at https://github.com/mat813/freebsd-ports/tree/d9a5e385afb3dab755ebe5138b09cf7351f992d9/graphics/py-mcomix/files


A patch file from https://github.com/void-linux/void-packages/pull/13148.patch is attached