Updates to the WindowsAPI translation instructions; D2 only?

[Walter Bright]

On 8/1/2013 10:17 PM, Jonathan M Davis wrote:
> Regardless, the biggest gain by far will be being able to ditch support for XP
> and require at least Vista. As bad as Vista was, it had some major
> improvements to the Win32 API (like adding a proper condition variable).

As a practical matter, we do not test on XP, and so it is disingenuous to claim 
official support for it.

I suggest saying we "officially" support Win7 or later, and unofficially support 
versions back to XP. Unofficially means there's code there to support it, and we 
accept pull requests to fix bugs in it, we will try not to break it, but we 
don't test or guarantee that it'll work.

It's like how we "support" Solaris and a VC-built dmd.