pfSense

NTPD listens for 127.0.0.1:123 and :: 1: 123 anyway, but this PR allows you to select only Loopback as the listening interface, for cases when you need to do port-forward to loopback and not listen to any other interface:
https://github.com/pfsense/pfsense/pull/4237

I also had a PR ready but I was waiting for the other requests to be merged
i had a different mods for that, i put it here if you like it

function build_interface_list() {
        global $pconfig;

        $iflist = array('options' => array(), 'selected' => array());

        $iflist['options']['lo0']       = gettext("localhost");
        if (empty($selectedifs) || empty($selectedifs[0]) || in_array("lo0", $selectedifs)) {
                array_push($iflist['selected'], "lo0");
        }