Reduce footprint of :fd property.

Querying the :fd stream property is equivalent to calling the
stream-fd function. Streams have a C virtual function get_fd,
so implementing :fd in their getprop functions is redundant
functionality.  The stream-getprop function can test for
:fd and call stream-fd, so the stream implementations don't
have to deal with the :fd property.

Also, there are still places in the code base that are using
stream_getprop to get the file descriptor, instead of calling
stream_fd.

If we fix all this, then fd_k remains referenced only in
a very small number of places.

* socket.c (dgram_get_prop): Don't handle :fd any more.

* stream.c (unimpl_get_fd): Static function removed.
(fill_stream_ops): Default the get_fd function to null_get_fd
instead of unimpl_get_fd, so it doesn't throw.
Even a stdio stream don't throw; when the file is closed,
it returns nil.
(stdio_get_prop): Don't handle :fd any more.
(stream_get_prop): Handle :fd here. If the stream has a get_fd
function that isn't null_get_fd, then call it. Only if the
stream doesn't have a get_fd function, fall back on its
get_prop function.

* sysif.c (mkdir_wrap, poll_wrap, simulate_setuid_setgid):
Call stream_fd instead of stream_get_prop.

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