Added blocklib.php. Now it seems to work.

(not really sure if this script should exist!!)
Bug 1702
(http://moodle.org/bugs/bug.php?op=show&bugid=1702)

backup/try.php

@@ -1,8 +1,9 @@
-<?php
+<?PHP //$Id$
     require_once ("../config.php");
     require_once ("backup_scheduled.php");
     require_once ("lib.php");
     require_once ("backuplib.php");
+    require_once ("$CFG->libdir/blocklib.php");
 
     require_login();