Merge branch 'z88dk-nonfree-files' into 'belenos'

Remove z88dk nonfree files

See http://www.z88dk.org/forum/viewtopic.php?pid=8504. The package z88dk was blacklisted, but the files with noncommercial restrictions are not required (test suite and keyboard driver), so I made a package helper to remove those files. Requires trisquel/ubuntu-purge!11.

See merge request !49