patch 9.1.1202: Missing TabClosedPre autocommand

Problem:  Missing TabClosedPre autocommand
          (zoumi)
Solution: Add the TabClosedPre autcommand (Jim Zhou).

fixes: #16518
closes: #16855

Signed-off-by: Jim Zhou <jimzhouzzy@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/proto/autocmd.pro b/src/proto/autocmd.pro
index ed85603..ff42b60 100644
--- a/src/proto/autocmd.pro
+++ b/src/proto/autocmd.pro
@@ -47,4 +47,5 @@
 void f_autocmd_add(typval_T *argvars, typval_T *rettv);
 void f_autocmd_delete(typval_T *argvars, typval_T *rettv);
 void f_autocmd_get(typval_T *argvars, typval_T *rettv);
+int has_tabclosedpre(void);
 /* vim: set ft=c : */