New comment by mnabid on void-packages repository

https://github.com/void-linux/void-packages/pull/20630#issuecomment-609117339

Comment:
@xtraeme Rhythmbox has GPL2+ license with **Gstreamer exception** (look [here](https://gitlab.gnome.org/GNOME/rhythmbox/-/blob/master/COPYING#L345)), but that's not listed in SPDX. 

Should I change the `license` value into `GPL-2.0-or-later` ? 

EDIT: Changed `license`.