Skip file_put_contents_variation7.phpt on Windows

While the test obviously succeeds on Windows, it may occasionally
conflict with file_put_contents_variation7-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/11527743659/job/32093951818>

Closes GH-16722.

Author: cmb69

ext/standard/tests/file/file_put_contents_variation7.phpt

@@ -2,6 +2,11 @@
 Test file_put_contents() function : usage variation - various absolute and relative paths
 --CREDITS--
 Dave Kelsey <[email protected]>
+--SKIPIF--
+<?php
+if(substr(PHP_OS, 0, 3) == "WIN")
+  die("skip Not for Windows");
+?>
 --FILE--
 <?php
 echo "*** Testing file_put_contents() : usage variation ***\n";