USER: stub implementation for GetLastInputInfo and SetLayeredWindowAttributes

[Mike McCormack]

Robert Shearman wrote:

> I have no doubt that there is an application that relies on this being 
> present, but it could break drawing for a number of other apps.

So I guess we have to make it work properly, or hack up GetProcAddress 
so that it fails if an application asks for SetLayeredWindowAttributes.

I'm kind of interested to see which applications break that way though.

Mike