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/evalvars.c b/src/evalvars.c
index d434d58..6b9c270 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -1668,6 +1668,7 @@
     switch (tv->v_type)
     {
 	case VAR_UNKNOWN:
+	case VAR_ANY:
 	case VAR_VOID:
 	case VAR_NUMBER:
 	case VAR_BOOL: