Add link to Windows Downloads (#1870)

* Add link to Windows Downloads

* Break into two panels due to interesting design choices

Author: derickr

downloads.php

@@ -22,7 +22,8 @@
 
 <p class="panel"><a href="/pre-release-builds.php">Pre-Release Builds</a></p>
 <p class="panel"><a href="/git.php">Development Sources (git)</a></p>
-<p class="panel"><a href="/releases/">Old Archives</a></p>
+<p class="panel"><a href="/releases/">Old Source Archives</a></p>
+<p class="panel"><a href="https://downloads.php.net/~windows/releases/archives/">Windows Archives</a></p>
 ';
 
 site_header("Downloads",