Backport into build-200909301147-5.0.84sp1

> ------------------------------------------------------------
> revno: 2802.1.1
> tags: mysql-5.0.86
> revision-id: hery.ramilison@sun.com-20090909185217-mooeczu391ztp2fz
> parent: joro@sun.com-20090902123318-8qe40pr91xmui5ue
> committer: hery <hery.ramilison@sun.com>
> branch nick: mysql-5.0.86-release
> timestamp: Wed 2009-09-09 20:52:17 +0200
> message:
>   change c++ comment to c comment

client/mysqltest.c

@@ -1404,7 +1404,7 @@ void show_diff(DYNAMIC_STRING* ds,
   else
     diff_name = 0;
 #else
-  diff_name = "diff";           // Otherwise always assume it's called diff
+  diff_name = "diff";           /* Otherwise always assume it's called diff */
 #endif
 
   if (diff_name)