Fix build on Windows
Fix build on Windows

Windows native shell doesn't understand shebangs. Also, make sure the Python
scripts are run by the same interpreter.

cvra/uavcan,diydrones/uavcan,diydrones/uavcan,cvra/uavcan,diydrones/uavcan,cvra/uavcan,cvra/uavcan,PX4/uavcan,diydrones/uavcan,PX4/uavcan,PX4/uavcan,PX4/uavcan