Don't show recently EOLed branches in the supported versions table.

Changed the behaviour of get_active_branches() so that callers can
choose whether to get recently EOLed branches or not. (This is basically
for the supported versions page; the other callers -- namely the front
page download links and bug tracker backend -- likely still want the
previous behaviour.)

After all, it's a little weird listing 5.5 as a supported version in the
table when we just made a big deal of EOLing it!

supported-versions.php

@@ -47,7 +47,7 @@ $VERSION_NOTES = array(
 		</tr>
 	</thead>
 	<tbody>
-		<?php foreach (get_active_branches() as $major => $releases): ?>
+		<?php foreach (get_active_branches(false) as $major => $releases): ?>
 			<?php ksort($releases) ?>
 			<?php foreach ($releases as $branch => $release): ?>
 				<?php