add support for network only to identify network plugins, see #12139

git-svn-id: http://svn.automattic.com/wordpress/trunk@12970 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/plugin.php

@@ -302,7 +302,7 @@ function is_network_only_plugin( $file ) {
 	/* PHP will close file handle, but we are good citizens. */
 	@fclose($fp);
 
-	if ( preg_match( '|Site Wide Only:(.*)true$|mi', $plugin_data ) )
+	if ( preg_match( '/(Network|Site Wide) Only:(.*)true$/mi', $plugin_data ) )
 		return true;
 
 	return false;