Added require_once for pagelib.php.

Now deleting courses with these activities in works just fine once more!

mod/chat/lib.php

@@ -2,6 +2,8 @@
 
 /// Library of functions and constants for module chat
 
+require_once($CFG->libdir.'/pagelib.php');
+
 if (!isset($CFG->chat_refresh_room)) {
     set_config("chat_refresh_room", 5);
 }

mod/quiz/lib.php

@@ -2,6 +2,8 @@
 
 /// Library of function for module quiz
 
+require_once($CFG->libdir.'/pagelib.php');
+
 /// CONSTANTS ///////////////////////////////////////////////////////////////////
 
 define("QUIZ_MAX_EVENT_LENGTH", "432000");   // 5 days maximum