Eliminate libupnp dependencies

[ahesford]

djmount is ancient (from 2006) and, after the initial packaging, has only ever been revbumped to rebuild for dependency updates. It refuses to build against libupnp1.8 or newer and is holding back our libupnp.

retroshare has some upstream patches to build against libupnp1.8 but they do not apply cleanly to the release version. However, the package builds against miniupnpc, so let's do that. We can revisit newer libupnp later if there is a compelling reason and they cut a new release.

This paves the way for updating libupnp to a modern version. Maybe we can unify the libupnp if we can clean up gerbera, mpd and vlc. If not, maybe libupnp should be a meta that pulls in the latest versioned package.