Drop compat code for old python version
Drop compat code for old python version

https://bugzilla.gnome.org/show_bug.cgi?id=698763

GNOME/pygobject,pexip/pygobject,sfeltman/pygobject,pexip/pygobject,GNOME/pygobject,pexip/pygobject,sfeltman/pygobject,davibe/pygobject,davibe/pygobject,sfeltman/pygobject,GNOME/pygobject,davibe/pygobject,davibe/pygobject