dinput: Fix name clashes (Resend #2)

[Andrew Talbot]

Alexandre Julliard wrote:

> The types are local to the C file so there is no clash. If some tools
> don't understand that they need to be fixed.
> 

Not arguing, just clarifying:

File #1: joystick_input.c has a non-static struct tag called "JoystickImpl".
File #2: joystick_linuxinput.c has a differently defined non-static tag
called "JoystickImpl". Since neither is declare static, do these not occupy
the same namespace?

-- 
Andy.