Update gtk3 to version 3.24.34 / rev 176 via SR 983440
https://build.opensuse.org/request/show/983440
by user dimstar + dimstar_suse
- Add dependency "python3x-gobject-Gdk if python3x-gobject" to the
typelib package (boo#1200614). (forwarded request 983261 from dimstar)