tests: call g_type_init only if using an old glib

Calling g_type_init() is not needed anymore and deprecated since
glib version 2.36.

https://bugs.freedesktop.org/show_bug.cgi?id=99812

tests/list.c

@@ -130,7 +130,10 @@ static void process_devices(char **argv)
 
 int main(int argc, char **argv)
 {
+#if !GLIB_CHECK_VERSION (2, 36, 0)
 	g_type_init();
+#endif
+
 	create_manager();
 
 	if (argc < 2) {