Snippets for gnome-shell 51.1 from Fedora s390x

Sourced from https://kojipkgs.fedoraproject.org/packages/gnome-shell/51.1/1.fc46/data/logs/s390x/build.log.

• /usr/include/glib-2.0/glib/gmacros.h:1397:10: warning: ‘windows’ may be used uninitialized [-Wmaybe-uninitialized]
   1397 |     { if (_ptr) (cleanup) ((ParentName *) _ptr); }                                                              \
        |          ^