patch 8.2.4864: Vim9: script test fails

Problem:    Vim9: script test fails.
Solution:   Remove "if" around declaration.
diff --git a/src/version.c b/src/version.c
index 0899944..1922323 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4864,
+/**/
     4863,
 /**/
     4862,