patch 8.2.0609: configure does not detect moonjit correctly

Problem:    Configure does not detect moonjit correctly.
Solution:   Double the brackets. (Ozaki Kiichi)
diff --git a/src/version.c b/src/version.c
index 2b1a126..61f71a0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    609,
+/**/
     608,
 /**/
     607,