Mark mcrypt-module as required.

It turns out that we are now always requiring the mcrypt module, so
mark it as required.

Thanks to Onivaldo Rosa Junior for reporting this bug!

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@3203 44740490-163a-0410-bde0-09ae8108e29a

docs/simplesamlphp-install.txt

@@ -35,8 +35,7 @@ Prerequisites
  * Some webserver capable of executing PHP scripts.
  * PHP version >= 5.2.0.
  * Suppoort for the following PHP extensions:
-   * Always required: `date`, `dom`, `hash`, `libxml`, `openssl`, `pcre`, `SPL`, `zlib`
-   * When encrypting assertions: `mcrypt`
+   * Always required: `date`, `dom`, `hash`, `libxml`, `openssl`, `pcre`, `SPL`, `zlib`, `mcrypt`
    * When authenticating against LDAP server: `ldap`
    * When authenticating against RADIUS server: `radius`
    * When saving session information to memcache-server: `memcache`

modules/core/www/frontpage_config.php

@@ -85,7 +85,7 @@ $functionchecks = array(
 	'simplexml_import_dom' => array('required', 'SimpleXML'),
 	'dom_import_simplexml' => array('required', 'XML DOM'),
 	'preg_match'       => array('required',  'RegEx support'),
-	'mcrypt_module_open'=> array('optional',  'MCrypt'),
+	'mcrypt_module_open'=> array('required',  'MCrypt'),
 	'mysql_connect'    => array('optional',  'MySQL support'),
 );
 if (SimpleSAML_Module::isModuleEnabled('ldap')) {