patch 8.2.4099: Vim9: cannot use Vim9 syntax in mapping

Problem:    Vim9: cannot use Vim9 syntax in mapping.
Solution:   Add <ScriptCmd> to use the script context for a command.
diff --git a/src/proto/getchar.pro b/src/proto/getchar.pro
index 9745ddf..2d791e5 100644
--- a/src/proto/getchar.pro
+++ b/src/proto/getchar.pro
@@ -52,5 +52,6 @@
 void vungetc(int c);
 int fix_input_buffer(char_u *buf, int len);
 int input_available(void);
-char_u *getcmdkeycmd(int promptc, void *cookie, int indent, getline_opt_T do_concat);
+int do_cmdkey_command(int key, int flags);
+void reset_last_used_map(void);
 /* vim: set ft=c : */