Add install links to the importer list if popular importers are not present. see #13465

git-svn-id: http://svn.automattic.com/wordpress/trunk@14759 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/admin.php

@@ -14,6 +14,9 @@
 if ( !defined('WP_ADMIN') )
 	define('WP_ADMIN', TRUE);
 
+if ( isset($_GET['import']) && !defined('WP_LOAD_IMPORTERS') )
+	define('WP_LOAD_IMPORTERS', true);
+
 require_once(dirname(dirname(__FILE__)) . '/wp-load.php');
 
 if ( get_option('db_upgraded') ) {