Function osm_gps_map_sys::osm_gps_map_image_add_z

pub unsafe extern "C" fn osm_gps_map_image_add_z(
    map: *mut OsmGpsMap, 
    latitude: c_float, 
    longitude: c_float, 
    image: *mut GdkPixbuf, 
    zorder: c_int
) -> *mut OsmGpsMapImage