datetime: Use DBus interface file from geoclue tarball

GeoClue 1.99.3 ships its DBus interface XML file in the tarball and
exposes it through pkgconfig, so we can get rid of the copy in
gnome-settings-daemon.

This is also needed to keep up with the GeoClue DBus API changes between
1.99.2 and 1.99.3.
Updated Lithuanian translation