Disable MSSQL for new CE installations

Since automatic schema migrations are not yet possible let's disable this for now.

lib/private/setup.php

@@ -88,7 +88,7 @@ class OC_Setup {
 			)
 		);
 		$configuredDatabases = $this->config->getSystemValue('supportedDatabases',
-			array('sqlite', 'mysql', 'pgsql', 'oci', 'mssql'));
+			array('sqlite', 'mysql', 'pgsql', 'oci'));
 		if(!is_array($configuredDatabases)) {
 			throw new Exception('Supported databases are not properly configured.');
 		}