test_gi: Fix TestFilename failure under C locale
test_gi: Fix TestFilename failure under C locale

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