Patch to pass file descriptors

[David E Euresti]

That I can tell shm doesn't work if the cygserver isn't running.  Why is
it demanded that passing file descriptors work without the cygserver?  I
mean currently you can't pass file descriptors so even having one optional
solution is better than no solution.

David

>I have objections.  This is neither fully discussed nor is it clear
>how to incorporate the call together with the cygserver-less descriptor
>passing code into fhandler_socket.cc so far.
>
>Corinna