#41 proper deftype socket for CMU CL

[David Tolpin]

In CMU CL, while a client socket is simple-socket-stream, a socket
returned by socket-accept is created with
(make-fd-stream (accept-tcp-connection , and this is an fd-stream.

The simplest way to handle it is to declare type socket as stream,
and not simple-socket-stream, in (or cmu scl) (I am not sure about
scl, but there is no trial download there).

[Sam Steingold]

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thanks!