Bug#1094736: transition: libcdio

["Gabriel F. T. Gomes" <gabriel@inconstante.net.br>]

I like the fact that autopkgtests are detecting this issue. The older
libiso9660 should work with the newer libcdio, because libcdio did not
break its ABI. I was thinking of investigating this further (e.g. with
a minimal reproducer, if I can make one) and even involve upstream if
something is indeed broken. The reason why I want to do this is that
the problem does not seem to be related to libdevice-cdio-perl, but a
problem with libcdio itself.

This would most likely delay the transition after the trixie release.