external/"dynamic packages":
 * consider both ${pkg} and ${pkg}-cgi packages while collecting package files (some package files are provided by ${pkg}-cgi, e.g. openvpn, ppp, transmission, etc.)
 * refs #2145
 * refs #2367


git-svn-id: file:///var/svn/freetz/trunk@11887 149334a1-2f27-0410-a3b9-fc62619ac1e6