mpris: Require DBusProxy for all proxy interfaces
mpris: Require DBusProxy for all proxy interfaces

GNOME/rygel,luisbg/rygel,GNOME/rygel,jku/rygel,Pelagicore/Media-Manager-Rygel-patched,Tarnyko/rygel,Tarnyko/rygel,Pelagicore/Media-Manager-Rygel-patched,Pelagicore/Media-Manager-Rygel-patched,GNOME/rygel,jku/rygel