Skip parse_ini_file_variation6.phpt on Windows

While the test obviously succeeds on Windows, it may occasionally
conflict with parse_ini_file_variation6-win32.phpt[1], so we skip it
like we do for many other of these tests which have win32 pendants.

[1] <https://github.com/php/php-src/actions/runs/12077554275/job/33680647284#step:6:119>

Closes phpGH-16989.

Author: cmb69

ext/standard/tests/file/parse_ini_file_variation6.phpt

@@ -2,6 +2,10 @@
 Test parse_ini_file() function : variation - various absolute and relative paths
 --CREDITS--
 Dave Kelsey <[email protected]>
+--SKIPIF--
+<?php
+if(substr(PHP_OS, 0, 3) == "WIN") die("skip Only run on Windows");
+?>
 --FILE--
 <?php
 echo "*** Testing parse_ini_file() : variation ***\n";