patch 8.2.0965: has_funcundefined() is not used

Problem:    Has_funcundefined() is not used.
Solution:   Delete the function. (Dominique Pellé, closes #6242)

src/autocmd.c

@@ -1760,15 +1760,6 @@ has_cmdundefined(void)
     return (first_autopat[(int)EVENT_CMDUNDEFINED] != NULL);
 }
 
-/*
- * Return TRUE when there is an FuncUndefined autocommand defined.
- */
-    int
-has_funcundefined(void)
-{
-    return (first_autopat[(int)EVENT_FUNCUNDEFINED] != NULL);
-}
-
 #if defined(FEAT_EVAL) || defined(PROTO)
 /*
  * Return TRUE when there is a TextYankPost autocommand defined.

src/proto/autocmd.pro

@@ -23,7 +23,6 @@ int has_textchangedI(void);
 int has_textchangedP(void);
 int has_insertcharpre(void);
 int has_cmdundefined(void);
-int has_funcundefined(void);
 int has_textyankpost(void);
 int has_completechanged(void);
 void block_autocmds(void);

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    965,
 /**/
     964,
 /**/