updated for version 7.4.415

Problem:    Cannot build.  Warning for shadowed variable. (John Little)
Solution:   Add missing change.  Remove declaration.

src/vim.h

@@ -1326,6 +1326,7 @@ enum auto_event
     EVENT_SHELLFILTERPOST,	/* after ":1,2!cmd", ":w !cmd", ":r !cmd". */
     EVENT_TEXTCHANGED,		/* text was modified */
     EVENT_TEXTCHANGEDI,		/* text was modified in Insert mode*/
+    EVENT_CMDUNDEFINED,		/* command undefined */
     NUM_EVENTS			/* MUST be the last one */
 };