Patch to let Alpha debuggers debug a remote target over Telnet

[Andrew Cagney]

Guy Harris wrote:
> 
> This patch adds "ser-tcp.o" to debuggers hosted on Alpha machines
> running OSF/1 3.x and later, so that they can debug remote targets over
> a Telnet connection to a terminal server as well as over a direct serial
> connection.  (Arguably, any debugger configuration that includes support
> for remote serial targets should include this as well.)

What about ser-pipe.c?

As to your more generic question/comment.  Yes, that code should be
selected by configure.in/autoconf and not via the XDEPFILES.

	Andrew