bug#32304: 27.0.50; tramp-tests issue with double slash

[Eli Zaretskii]

> From: Ken Brown <kbrown@cornell.edu>
> Date: Mon, 30 Jul 2018 08:17:48 -0400
> Cc: 32304@debbugs.gnu.org
> 
> On 7/30/2018 6:43 AM, Michael Albinus wrote:
> 
> Hi Michael,
> 
> > There's another patch, could you pls check?
> 
> Yes, that fixes it on Cygwin.  Thanks.

The MinGW build also passes, but the other two still fail:

  2 unexpected results:
     FAILED  tramp-test43-auto-load
     FAILED  tramp-test44-unload

Should they be skipped?

Thanks.