patch 8.2.0616: build error when disabling the diff feature

Problem:    Build error when disabling the diff feature.
Solution:   Move parenthesis outside of #ifdef. (Tom Ryder)
diff --git a/src/version.c b/src/version.c
index 4662de6..f8eccbf 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    616,
+/**/
     615,
 /**/
     614,