[gdbserver/RFC/RFA] Implement multiprocess extensions, add linux multiproces support.

[Eli Zaretskii]

> From: Pedro Alves <pedro@codesourcery.com>
> Date: Mon, 30 Mar 2009 15:28:00 +0100
> 
> This patch adds multiprocess support to gdbserver.

Thanks.

If this is approved, I think we will want a NEWS entry.