Fix obvious issue which probably broke build on windows.
Fix obvious issue which probably broke build on windows.

dronekit/dronekit-la,dronekit/dronekit-la,peterbarker/dronekit-la,peterbarker/dronekit-la,dronekit/dronekit-la,peterbarker/dronekit-la,peterbarker/dronekit-la,dronekit/dronekit-la