patch 8.1.0475: memory not freed on exit when quit in autocmd

Problem:    Memory not freed on exit when quit in autocmd.
Solution:   Remember funccal stack when executing autocmd.
diff --git a/src/proto/userfunc.pro b/src/proto/userfunc.pro
index 3149ec5..ac9bdc0 100644
--- a/src/proto/userfunc.pro
+++ b/src/proto/userfunc.pro
@@ -39,15 +39,13 @@
 int *func_dbg_tick(void *cookie);
 int func_level(void *cookie);
 int current_func_returned(void);
-void *save_funccal(void);
-void restore_funccal(void *vfc);
+void save_funccal(funccal_entry_T *entry);
+void restore_funccal(void);
 int free_unref_funccal(int copyID, int testing);
 hashtab_T *get_funccal_local_ht(void);
 dictitem_T *get_funccal_local_var(void);
 hashtab_T *get_funccal_args_ht(void);
 dictitem_T *get_funccal_args_var(void);
-void *clear_current_funccal(void);
-void restore_current_funccal(void *f);
 void list_func_vars(int *first);
 dict_T *get_current_funccal_dict(hashtab_T *ht);
 hashitem_T *find_hi_in_scoped_ht(char_u *name, hashtab_T **pht);