MFH: fix broken test

Author: indeyets

ext/standard/tests/misc/time_nanosleep_error4.phpt

@@ -2,7 +2,7 @@
 time_nanosleep — Delay for a number of seconds and nanoseconds
 --SKIPIF--
 <?php
-if (substr(strtoupper(PHP_OS, 'WIN'))) die("skip Test is not valid for Windows");
+if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') die("skip Test is not valid for Windows");
 if (!function_exists('time_nanosleep')) die("skip");
 ?>
 --CREDITS--