Bug#775483: hexen: verify that the demo works in some packaged engine, and re-enable

[Simon McVittie]

Package: game-data-packager
Version: 39
Severity: wishlist

The Hexen demo (shareware version? incomplete version, anyway) is currently
commented out because it crashes chocolate-doom, but all the necessary bits
are present in data/hexen.yaml. Maybe it works in doomsday or something.

It seems a bit undesirable that the Doom engine installed by our preferred
dependency, chocolate-doom, is the one that can't actually play all the games.
If someone creates a separate data/hexen-demo-data.control.in then at
least hexen-demo-data wouldn't depend on an engine that can't play it.

    S