Fix skipif for windows

Author: iluuu1994

ext/opcache/tests/gh15021.phpt

@@ -1,11 +1,15 @@
 --TEST--
 GH-15021: Optimizer only relies on preloaded top-level symbols
---EXTENSIONS--
-opcache
 --INI--
 opcache.enable=1
 opcache.enable_cli=1
 opcache.preload={PWD}/gh15021_preload.inc
+--EXTENSIONS--
+opcache
+--SKIPIF--
+<?php
+if (PHP_OS_FAMILY == 'Windows') die('skip Preloading is not supported on Windows');
+?>
 --FILE--
 <?php
 putenv('RUNTIME=1');