Licence of w32-api directx headers

[tonytheodore]

On a recent mingw-users thread, a point was raised around the way headers are developed (public documentation, clean room, reverse engineering etc.) and it made me wonder about our directx patches. This:

*  Copyright (C) 1996-2000 Microsoft Corporation.  All Rights Reserved.
*
*  File:       dinput.h
*  Content:    DirectInput include file

makes it seem like an unlicensed copy of Microsoft sources.

Any thoughts?

[mabrand]

I believe I'm not qualified to have an opinion on these questions, but those headers were added to MXE a long time ago. They are probably available elsewhere these days, such as from the mingw-w64 project or Wine. We could consider simply stopping the practice of supplementing the mingw headers, which would mean dropping mingw support for a number of packages.

[tonytheodore]

See #492