Revert "Skip bug45161.phpt on Windows"

This reverts commit 4b22c3e3ad.

As quick measure for GH-10753, that test was skipped on Windows.
However, it seems that there are no longer performance issues with
newer cURL versions, so we run that test again on Windows.

Fixes GH-10753.
Closes GH-14998.

ext/curl/tests/bug45161.phpt

@@ -2,10 +2,6 @@
 Bug #45161 (Reusing a curl handle leaks memory)
 --EXTENSIONS--
 curl
---SKIPIF--
-<?php
-if (PHP_OS_FAMILY === 'Windows') die('skip This test is insanely slow on Windows');
-?>
 --FILE--
 <?php
 include 'server.inc';