[gtk/ebassi/timezone-ctor] Cope with g_time_zone_new() deprecation in GLib 2.68

[Emmanuele Bassi <ebassi src gnome org>]

commit b6315887957b7a4cd9ee7f8203f11107a2ad1238
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Nov 23 11:33:22 2020 +0000

    Cope with g_time_zone_new() deprecation in GLib 2.68

 demos/gtk-demo/listview_clocks.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/demos/gtk-demo/listview_clocks.c b/demos/gtk-demo/listview_clocks.c
index 22a463823d..b25a044712 100644
--- a/demos/gtk-demo/listview_clocks.c
+++ b/demos/gtk-demo/listview_clocks.c
@@ -346,6 +346,10 @@ create_clocks_model (void)
 
   result = g_list_store_new (GTK_TYPE_CLOCK);
 
+#if GLIB_CHECK_VERSION (2, 67, 0)
+# define g_time_zone_new        g_time_zone_new_identifier
+#endif
+
   /* local time */
   clock = gtk_clock_new ("local", NULL);
   g_list_store_append (result, clock);