swrap: Fix buliding on unix systems without AF_NETLINK
swrap: Fix buliding on unix systems without AF_NETLINK

Signed-off-by: Andreas Schneider <5be00ddc76278cf6077f5047ca3384a88460c671@samba.org>
Reviewed-by: Ralph Boehme <57e8a7776d6892a83f2a49678f8141f4fb883e62@samba.org>

anoopcs9/socket_wrapper,anoopcs9/socket_wrapper