don't offer install.php on check-fancy requests

this time, E_STRICT compliant

lib/common.php

@@ -19,6 +19,9 @@
 
 if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
 
+//exit with 200 response, if this is checking fancy from the installer
+if (isset($_REQUEST['p']) && $_REQUEST['p'] == 'check-fancy') {  exit; } 
+
 define('STATUSNET_VERSION', '0.9.0dev');
 define('LACONICA_VERSION', STATUSNET_VERSION); // compatibility