red-channel: send marshaller message fd
red-channel: send marshaller message fd

Send the fd associated to the last message sent.

Signed-off-by: Marc-André Lureau <a6f2b960a4aca61381fc650a67901b2ac8e83e6d@gmail.com>
Acked-by: Frediano Ziglio <55d48b080b2e443e395cde84d2c83b135a4ff48e@redhat.com>

SPICE/spice,SPICE/spice,fgouget/spice,fgouget/spice,fgouget/spice,SPICE/spice,fgouget/spice