service: Drop geocode-glib copy
The geocode-glib copy is out-of-date and updating it is not as trivial as it used to be since geocode-location module is not so independent of the rest of the code any more. Also geocode-glib doesn't see much changes these days, especially to the geocode-location module so the effort to port the code, isn't really worth it. We already copied over the needed code in a previous commit and now we ditch our geode-glib internal copy and dependency. Fixes #88.