patch 7.4.800

Problem:    Using freed memory when triggering CmdUndefined autocommands.
Solution:   Set pointer to NULL. (Dominique Pelle)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    800,
 /**/
     799,
 /**/