bug#23759: 25.1.50; open-tls-stream creates malformed gnutls-cli command if trusted cert files don't exist

[Eli Zaretskii]

> From: flitterio@gmail.com (Francis Litterio)
> Date: Sun, 12 Jun 2016 17:32:56 -0400
> 
> Using Emacs built from the latest mainline source on Windows 7 (with all 
> updates applied),
> I see this problem:
> 
> 1. Launch Emacs using: emacs.exe -Q
> 
> 2. Evaluate this form in buffer *scratch*:
> 
>    (progn
>      (require 'tls)
>      (open-tls-stream "foo" nil "irc.oftc.net" 6697))
> 
> After the connection is established, buffer *Messages* shows two failed 
> connection
> attempts using gnutls-cli, followed by a successful connection using openssl:

TLS connections on MS-Windows are supported via the GnuTLS library.
External TLS programs will never work correctly on Windows, since they
use signals to communicate with Emacs.  So there's little sense in
fixing this issue, because the result will not work anyway.

Thanks.