bug#14541: 24.3.50; `ediff-buffers' does not play well with recent Cygwin version

[Eli Zaretskii]

> From: Achim Gratz <Stromeko@nexgo.de>
> Date: Thu, 06 Jun 2013 21:07:08 +0200
> 
> Yes.  That warning says "please do not hand a Windows path to Cygwin",
> so you would never see this warning or need an option to suppress it if
> you would use POSIX paths only.  The tool to convert between the two
> representations is cygpath.

That's unworkable.  There's no way to set up Emacs to use cygpath in
every place it passes a file name to external programs.  Especially if
some of those programs are native Windows executables, not Cygwin
programs.

So no, there's no way at all to arrange for Cygwin programs invoked
from a native Emacs to always get Posix-style file names.