[rfa/copyright] add copyrights to gdb.mi/pthreads.c, gdb.threads/pthreads.c

[Andrew Cagney]

> Okay, here is another version of gdb.threads/pthreads.c.
> I'll focus on this file first.
> 
> I can almost see daylight from here ...
> 
> ac> Mention that it was written by Fred Fish, and contributed by Red Hat.
> 
> I wrote:
> 
>   Written by Fred Fish of Cygnus Support.
>   Contributed by Cygnus Support.
> 
> It was "Cygnus Support" in 1996.  Is that okay?

M'kay.

> Yes, can you send me the whole cygnus "cvs log" for this file.
> Or was that the whole log?
> 
> Were there any changes in 1997, 1998?

That is the whole log!  Everything else is external.

Andrew