patch 8.2.3426: crash when deleting a listener in a listener callback

Problem:    Crash when deleting a listener in a listener callback. (Naohiro
            Ono)
Solution:   Mark the listener and delete it later.

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3426,
 /**/
     3425,
 /**/