issue #1852 ability to disable core/extensions updates

admin/updates_ext.php

@@ -11,6 +11,11 @@ if( !defined("PHPWG_ROOT_PATH") )
   die ("Hacking attempt!");
 }
 
+if (!$conf['enable_extensions_install'])
+{
+  die('Piwigo extensions install/update system is disabled');
+}
+
 if (!is_webmaster())
 {
   $page['warnings'][] = str_replace('%s', l10n('user_status_webmaster'), l10n('%s status is required to edit parameters.'));