patch 8.2.0517: Vim9: cannot separate "func" and "func(): void"

Problem:    Vim9: cannot separate "func" and "func(): void".
Solution:   Use VAR_ANY for "any" and VAR_UNKNOWN for "no type".
diff --git a/src/globals.h b/src/globals.h
index 1a6a0d8..6f594e9 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -379,7 +379,8 @@
 
 
 // Commonly used types.
-EXTERN type_T t_any INIT6(VAR_UNKNOWN, 0, 0, 0, NULL, NULL);
+EXTERN type_T t_unknown INIT6(VAR_UNKNOWN, 0, 0, 0, NULL, NULL);
+EXTERN type_T t_any INIT6(VAR_ANY, 0, 0, 0, NULL, NULL);
 EXTERN type_T t_void INIT6(VAR_VOID, 0, 0, 0, NULL, NULL);
 EXTERN type_T t_bool INIT6(VAR_BOOL, 0, 0, 0, NULL, NULL);
 EXTERN type_T t_special INIT6(VAR_SPECIAL, 0, 0, 0, NULL, NULL);
@@ -390,6 +391,7 @@
 EXTERN type_T t_job INIT6(VAR_JOB, 0, 0, 0, NULL, NULL);
 EXTERN type_T t_channel INIT6(VAR_CHANNEL, 0, 0, 0, NULL, NULL);
 
+EXTERN type_T t_func_unknown INIT6(VAR_FUNC, -1, 0, 0, &t_unknown, NULL);
 EXTERN type_T t_func_void INIT6(VAR_FUNC, -1, 0, 0, &t_void, NULL);
 EXTERN type_T t_func_any INIT6(VAR_FUNC, -1, 0, 0, &t_any, NULL);
 EXTERN type_T t_func_number INIT6(VAR_FUNC, -1, 0, 0, &t_number, NULL);
@@ -401,8 +403,8 @@
 
 EXTERN type_T t_list_any INIT6(VAR_LIST, 0, 0, 0, &t_any, NULL);
 EXTERN type_T t_dict_any INIT6(VAR_DICT, 0, 0, 0, &t_any, NULL);
-EXTERN type_T t_list_empty INIT6(VAR_LIST, 0, 0, 0, &t_void, NULL);
-EXTERN type_T t_dict_empty INIT6(VAR_DICT, 0, 0, 0, &t_void, NULL);
+EXTERN type_T t_list_empty INIT6(VAR_LIST, 0, 0, 0, &t_unknown, NULL);
+EXTERN type_T t_dict_empty INIT6(VAR_DICT, 0, 0, 0, &t_unknown, NULL);
 
 EXTERN type_T t_list_bool INIT6(VAR_LIST, 0, 0, 0, &t_bool, NULL);
 EXTERN type_T t_list_number INIT6(VAR_LIST, 0, 0, 0, &t_number, NULL);