Install pygobject dependency and bump versions of some of its dependencies. Fix gobject-introspection build error on host by setting -Dbuild_introspection_data=false.
Update bluezutils.py to use items() function renamed in recent python versions.
Remove .cache dir from agentpath, otherwise dbus complains that the path is invalid. The directory exists so it's unclear what the real problem is here.
Include python_fix_abi function in build so target files don't get host arch naming.
