patch 8.2.0149: maintaining a Vim9 branch separately is more work

Problem:    Maintaining a Vim9 branch separately is more work.
Solution:   Merge the Vim9 script changes.
diff --git a/src/proto/evalfunc.pro b/src/proto/evalfunc.pro
index 064f12f..59ff35c 100644
--- a/src/proto/evalfunc.pro
+++ b/src/proto/evalfunc.pro
@@ -1,8 +1,13 @@
 /* evalfunc.c */
 char_u *get_function_name(expand_T *xp, int idx);
 char_u *get_expr_name(expand_T *xp, int idx);
+int find_internal_func(char_u *name);
 int has_internal_func(char_u *name);
+char *internal_func_name(int idx);
+type_T *internal_func_ret_type(int idx, int argcount);
+int check_internal_func(int idx, int argcount);
 int call_internal_func(char_u *name, int argcount, typval_T *argvars, typval_T *rettv);
+void call_internal_func_by_idx(int idx, typval_T *argvars, typval_T *rettv);
 int call_internal_method(char_u *name, int argcount, typval_T *argvars, typval_T *rettv, typval_T *basetv);
 int non_zero_arg(typval_T *argvars);
 linenr_T tv_get_lnum(typval_T *argvars);
@@ -13,6 +18,7 @@
 void execute_redir_str(char_u *value, int value_len);
 void execute_common(typval_T *argvars, typval_T *rettv, int arg_off);
 void mzscheme_call_vim(char_u *name, typval_T *args, typval_T *rettv);
+void range_list_materialize(list_T *list);
 float_T vim_round(float_T f);
 long do_searchpair(char_u *spat, char_u *mpat, char_u *epat, int dir, typval_T *skip, int flags, pos_T *match_pos, linenr_T lnum_stop, long time_limit);
 void f_string(typval_T *argvars, typval_T *rettv);