Bug#943430: fix installation of extension modules for 3.8

[Matthias Klose]

Package: src:pygobject
Version: 3.34.0-1
Severity: important
Tags: sid bullseye patch
User: debian-python at lists.debian.org
Usertags: python3.8

Fix installation of Python 3.8 extensions, dropping the m modifier in the name. 
An alternative might be to use PYBUILD_NAME, however that requires some more 
packaging changes.

http://launchpadlibrarian.net/447713946/pygobject_3.34.0-1build1_3.34.0-1ubuntu1.diff.gz