bug#19989: 25.0.50; Build instructions on Windows

[Eli Zaretskii]

> Date: Sat, 15 Aug 2015 14:24:16 +0200
> From: Dani Moncayo <dmoncayo@gmail.com>
> Cc: 19989@debbugs.gnu.org
> 
> >> Eli, I've noticed that the file 'nt/zipdist.bat' was not removed by
> >> the above change.  I think it should, no?
> >
> > I wouldn't know.  Is it not useful outside that old build procedure?
> 
> It was used by the (now obsolete) "dist" target.  I don't think it's
> worth keeping it anymore in the repo.

OK, then feel free to delete.