Windows build not working on Windows 8.1

[ataffanel]

When launching the windows build on Windows 8.1 the following error message appears:

The client is not using any Bluetooth API so this should not be a problem, the reason should be investigated.

[ataffanel]

Fixed, tested with windows build of the commit: https://ci.appveyor.com/project/bitcraze/crazyflie-clients-python/builds/21438362/artifacts