patch 9.0.1563: GTK3: window manager resize hints are incomplete

Problem:    GTK3: window manager resize hints are incomplete.
Solution:   Use NULL for second argument of gtk_window_set_geometry_hints().
            (Kenny Stauffer closes #11055)
diff --git a/src/version.c b/src/version.c
index 80244d6..0e1e326 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1563,
+/**/
     1562,
 /**/
     1561,