Remove old file.

- Didn't work (fatal error) in global.inc
- Never used in the platform.

404.php

@@ -1,11 +0,0 @@
-<?php
-// HTTP404 page with neat styling
-// 2011, Jean-Karim Bockstael <jeankarim@cblue.be>
-// ErrorDocument 404 /404/
-require_once '../main/inc/global.inc.php';
-
-$msg = get_lang('FileNotFound');
-Display::display_header($msg);
-Display::display_error_message($msg);
-Display::display_footer();
-