Joomla entivorment check needs to be updated to 1.5 style in some files

In Joomla 1.5 the environment check should be

defined('_JEXEC') or die('No direct access allowed');

Some of these files have old style checks and some have no checks.

civicrm.php

civicrm.html.php
configure.php
install.civicrm.php
uninstall.civicrm.php
settings.civicrm.php