gst-plugins-bad-1.0.recipe: Add missing libnice dep
gst-plugins-bad-1.0.recipe: Add missing libnice dep

* Explicitly enable webrtc so the build fails if deps can't be found
* Add missing devel files for libgstwebrtc-1.0

nirbheek/cerbero,nirbheek/cerbero,atsushieno/cerbero,atsushieno/cerbero,atsushieno/cerbero,atsushieno/cerbero,GStreamer/cerbero,centricular/cerbero,fluendo/cerbero,centricular/cerbero,GStreamer/cerbero,GStreamer/cerbero,GStreamer/cerbero,centricular/cerbero,centricular/cerbero,GStreamer/cerbero,centricular/cerbero,fluendo/cerbero,nirbheek/cerbero,fluendo/cerbero,atsushieno/cerbero,nirbheek/cerbero,fluendo/cerbero,fluendo/cerbero