patch 8.2.1531: Vim9: test still fails on MS-Windows

Problem:    Vim9: test still fails on MS-Windows.
Solution:   When skipping expect function to be NULL.

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1531,
 /**/
     1530,
 /**/