bug#55153: 29.0.50; Implement system_process_attributes on Cygwin

[Eli Zaretskii]

> Date: Wed, 27 Apr 2022 12:45:45 -0400
> Cc: 55153@debbugs.gnu.org
> From: Ken Brown <kbrown@cornell.edu>
> 
> > Is what you read from /proc/<pid>/ctty guaranteed to be pure-ASCII
> > string?
> 
> Yes.  It's typically something like "/dev/pty0".
> 
> > P.S. Doesn't this warrant a NEWS entry?
> 
> Revised patch attached, with a NEWS entry.

Thanks, LGTM.