Remove GLib requirement check

The requirement for GLib above 2.36 is already included in the
configuration file. So this type check is redundant.

src/dbus.c

@@ -597,10 +597,6 @@ int dbus_init(void)
 {
         guint owner_id;
 
-        #if !GLIB_CHECK_VERSION(2,35,0)
-                g_type_init();
-        #endif
-
         introspection_data = g_dbus_node_info_new_for_xml(introspection_xml,
                                                           NULL);