[RFA] Add Windows x64 SEH unwinder

[Eli Zaretskii]

> From: Tristan Gingold <gingold@adacore.com>
> Date: Mon, 18 Jun 2012 11:17:47 +0200
> Cc: "gdb-patches@sourceware.org ml" <gdb-patches@sourceware.org>, Kai Tietz <ktietz70@googlemail.com>, Mark Kettenis <mark.kettenis@xs4all.nl>
> 
> +* GDB can now use Windows x64 unwinding data.

This is GDB hacker oriented, not user-oriented.  I believe your
original message included a much more user-friendly summary of this
change; how about using it in NEWS?

Thanks.