patch 8.2.4530: making comparison with null work changes legacy behavior

Problem:    Making comparison with null work changes legacy behavior.
Solution:   Only use the better comparison in Vim9 script. (closes #9910)
diff --git a/src/version.c b/src/version.c
index 3e212db..0aff73a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4530,
+/**/
     4529,
 /**/
     4528,