patch 8.2.4367: calling in_vim9script() multiple times

Problem:    Calling in_vim9script() multiple times.
Solution:   Call it once and keep the result.
diff --git a/src/version.c b/src/version.c
index 7212b63..9daa359 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4367,
+/**/
     4366,
 /**/
     4365,