[PATCH] include: Add IArcadeStick interface in windows.gaming.input.idl

[Biswapriyo Nath]

Thank you for the review. These interface declarations are required
for SDL2 project[1]. The IDL files will be imported to mingw-w64
project and then those will be used to compile SDL2. If these changes
are inappropriate for wine I can try to ask mingw-w64 developers to
maintain IDL files without syncing with wine.

[1]: https://github.com/libsdl-org/SDL/blob/release-2.0.20/src/joystick/windows/SDL_windows_gaming_input.c