community/system-config-printer: add missing dependencies
otherwise, it fails to run:
Traceback (most recent call last): File "/usr/share/system-config-printer/system-config-printer.py", line 37, in gi.require_version('GdkPixbuf', '2.0') AttributeError: module 'gi' has no attribute 'require_version'
Edited by Michał Polański