marshaller: learn to describe fd passing in messages

The marshaller can't serialize fd in memory stream. Instead, append the
fd to the marshaller structure. The marshaller user is responsible for
sending the fd when the message is sent. The fd to send can be retrieved
with spice_marshaller_get_fd().

Note: only a single fd is supported with this API, supporting multiple
fd is left for the future if it becomes necessary.

Signed-off-by: Marc-André Lureau <marcandre.lureau@gmail.com>
Acked-by: Frediano Ziglio <fziglio@redhat.com>

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