This disables deprecated functions, then proceeds to use newly
deprecated functions. Given GTK2 is now EOL and unchanging,
there's no reason to avoid these without migration to newer GTK.

https://bugs.gentoo.org/874642
https://bugs.gentoo.org/391105 (see also)
--- a/test/test-module.c
+++ b/test/test-module.c
@@ -23,5 +23,4 @@
 #include <string.h>
 
-#define GTK_DISABLE_DEPRECATED
 
 #include <gtk/gtk.h>