This package should behave normally with dpkg-source -x for adding and
removing modifications.

Please note that the upstream source must be repacked for two reasons:

1. It's in zip format, so it needs unzipping and re-making with tar

2. It unzips into a directory called Dubtrain Angband Sound Pack v3.1.0/,
which needs to be renamed angband-audio-3.1.0. (The tarball itself must
also be renamed to the debian standard format.)
