Description: PHP 5.4 removed the session_unregister function.
 Replace it with the SquirrelMail-internal custom implementation.
Origin: upstream, http://squirrelmail.svn.sourceforge.net/viewvc/squirrelmail?view=revision&revision=14343

--- a/plugins/message_details/message_details_bottom.php
+++ b/plugins/message_details/message_details_bottom.php
@@ -85,7 +85,7 @@
 $messageheaderstart=false;
 $boundaries = array();
 $entities = array();
-session_unregister("entities");
+sqsession_unregister("entities");
 $pre = '<b>';
 $end = '</b>';
 $entStr = '';
