Fixed test skip

Author: laruence

ext/dom/tests/bug76285.phpt

@@ -1,5 +1,8 @@
 --TEST--
 Bug #76285 DOMDocument::formatOutput attribute sometimes ignored
+--SKIPIF--
+<?php require_once('skipif.inc'); ?>
+<?php if (!defined("LIBXML_HTML_NOIMPLIED")) die("skip libxml2 2.7.7 required"); ?>
 --FILE--
 <?php
 
@@ -15,4 +18,4 @@ var_dump($dom->saveHTML());
 --EXPECT--
 string(56) "<div><div><a>test</a></div><div><a>test2</a></div></div>"
 string(57) "<div><div><a>test</a></div><div><a>test2</a></div></div>
-"
+"