errorreport: Add hostname to the report.

Thanks to Thijs Kinkhorst for implementing this!

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2975 44740490-163a-0410-bde0-09ae8108e29a

www/errorreport.php

@@ -49,6 +49,9 @@ $message = '<h1>SimpleSAMLphp Error Report</h1>
 <p>URL:</p>
 <pre><a href="' . $data['url'] . '">' . $data['url'] . '</a></pre>
 
+<p>Host:</p>
+<pre>' . htmlspecialchars(php_uname('n')) . '</pre>
+
 <p>Directory:</p>
 <pre>' . dirname(dirname(__FILE__)) . '</pre>