patch 8.1.1711: listener callback called at the wrong moment

Problem:    Listener callback called at the wrong moment
Solution:   Invoke listeners before calling ml_delete_int(). (closes #4657)

src/version.c

@@ -777,6 +777,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1711,
 /**/
     1710,
 /**/