Try to run test on windows

Author: nikic

ext/libxml/tests/libxml_entity_loading_disabled_by_default.phpt

@@ -4,7 +4,7 @@ libxml_disable_entity_loader()
 <?php
 if (!extension_loaded('libxml')) die('skip libxml extension not available');
 if (!extension_loaded('dom')) die('skip dom extension not available');
-if (defined('PHP_WINDOWS_VERSION_MAJOR')) die('skip not for Windows'); ?>
+?>
 --FILE--
 <?php
 
@@ -14,7 +14,8 @@ $xml = <<<EOT
 <foo>&xxe;</foo>
 EOT;
 
-$xml = str_replace('XXE_URI', __DIR__ . '/libxml_disable_entity_loader_payload.txt', $xml);
+$dir = str_replace('\\', '/', __DIR__);
+$xml = str_replace('XXE_URI', $dir . '/libxml_disable_entity_loader_payload.txt', $xml);
 
 function parseXML1($xml) {
   $doc = new DOMDocument();