Function osm_gps_map_sys::osm_gps_map_download_maps

pub unsafe extern "C" fn osm_gps_map_download_maps(
    map: *mut OsmGpsMap, 
    pt1: *mut OsmGpsMapPoint, 
    pt2: *mut OsmGpsMapPoint, 
    zoom_start: c_int, 
    zoom_end: c_int
)