patch 9.1.0741: No way to get prompt for input()/confirm()

Problem:  No way to get prompt for input()/confirm()
Solution: add getcmdprompt() function (Shougo Matsushita)
          (Shougo Matsushita)

closes: #15667

Signed-off-by: Shougo Matsushita <Shougo.Matsu@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/proto/ex_getln.pro b/src/proto/ex_getln.pro
index 956916d..8cf75b7 100644
--- a/src/proto/ex_getln.pro
+++ b/src/proto/ex_getln.pro
@@ -33,12 +33,14 @@
 void f_getcmdcompltype(typval_T *argvars, typval_T *rettv);
 void f_getcmdline(typval_T *argvars, typval_T *rettv);
 void f_getcmdpos(typval_T *argvars, typval_T *rettv);
+void f_getcmdprompt(typval_T *argvars, typval_T *rettv);
 void f_getcmdscreenpos(typval_T *argvars, typval_T *rettv);
 void f_getcmdtype(typval_T *argvars, typval_T *rettv);
 void f_setcmdline(typval_T *argvars, typval_T *rettv);
 void f_setcmdpos(typval_T *argvars, typval_T *rettv);
 int get_cmdline_firstc(void);
 int get_list_range(char_u **str, int *num1, int *num2);
+void set_prompt(char_u* str);
 char *did_set_cedit(optset_T *args);
 int is_in_cmdwin(void);
 char_u *script_get(exarg_T *eap, char_u *cmd);