cc'ing the secure testing team, as they're listed as maintaining the
list of embedded code copies https://wiki.debian.org/EmbeddedCodeCopies
A comparison of files in cdrkit-1.1.10:libhfs_iso/ and
hfsutils-3.2.6:libhfs/ suggest that they're derived from the same
source, albeit with a range of different modifications at this point.
if any of the common-ancestor code has problems, it will need to be
fixed in both places.
If it was possible to break out the code into a shared library, future
maintenance and security work would be improved.