1.5.6 no longer ships any cgi script, this is just a bitrot that noone will get installed since it requires (unstable) app-cdr/disc-cover-1.5.4-r1 while we have 1.5.6 stable.
Thanks for the note. Scheduled for removal in 30 days. http://article.gmane.org/gmane.linux.gentoo.devel/54825
done