Dropping gupnp-vala

[Jens Georg <mail jensge org>]

Hi,

Since the last gupnp-* unstable releases, gupnp-vala is more or less
obsolete since all of them generate the vala bindings themselves now
from gobject-introspection.

Looking at the modulesets, Rygel is the only project that depends on
gupnp-vala and I've already removed that dependency.

Is everyone ok with dropping gupnp-vala completely from 3.8 (and later)
-apps or did I overlook something?