patch 8.2.0608: warning from clang when building message test

Problem:    Warning from clang when building message test.
Solution:   Use a void pointer.  (Dominique Pelle, closes #5958)
diff --git a/src/version.c b/src/version.c
index f175ff3..2b1a126 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    608,
+/**/
     607,
 /**/
     606,