Fix build on FreeBSD 8/9 by including sys/socket.h

Signed-off-by:  Juergen Lock <nox@jelal.kn-bremen.de>
Fix build on FreeBSD 8/9 by disabling VFCF_SBRDY

Signed-off-by:  Juergen Lock <nox@jelal.kn-bremen.de>