Commit 76b6ce8 added a downstream patch to remove the use of the
deprecated stock items. This however added new strings that the current
avahi tarball doesn't ship translations for, and as such we shouldn't do
it downstream.
Instead, just allow the deprecated GTK+ symbols. The deprecated API and
-Werror should never have been enabled in the tarball builds in the
first place.
https://bugzilla.redhat.com/show_bug.cgi?id=1001676
