bug#68320: 30.0.50; filename completion with tramp fails on Windows

[Corwin Brust]

> > Michael Albinus <michael.albinus@gmx.de> writes:
> > >>> 1. Start Emacs that is placed in D: drive.
> > >>> 2. Evaluate (require 'tramp) to load tramp.el.
> > >>> 3. Type C-x C-f c : / TAB TAB
> > >>
> > >
> > I've fixed this in the master branch. Could you, pls, give it some
> > testing.
>

I can no longer reproduce as of cd0eb055fd4ebc3f7f7f5f5617549f963fe8ecff

Here is a set of Windows x64 binaries created from that revision:

https://corwin.bru.st/emacs-30/emacs-30-cd0eb0/