The gdal library is too big. suggest remove GDAL dependent library。

If a developer attempts to calculate directions with more than three waypoints, the following error is returned:

Error Domain=MBDirectionsErrorDomain Code=-1 "Too many coordinates;
maximum number of coordinates is 3." 
UserInfo={NSLocalizedFailureReason=Too many coordinates;
maximum number of coordinates is 3.}

It appears the [Mapbox Directions API](https://www.mapbox.com/api-d