fix ipv6 struct alignment
fix ipv6 struct alignment

iovisor/bcc,brendangregg/bcc,mcaleavya/bcc,mcaleavya/bcc,iovisor/bcc,brendangregg/bcc,brendangregg/bcc,iovisor/bcc,mcaleavya/bcc,brendangregg/bcc,mcaleavya/bcc,tuxology/bcc,tuxology/bcc,brendangregg/bcc,iovisor/bcc,tuxology/bcc,iovisor/bcc,tuxology/bcc,tuxology/bcc,mcaleavya/bcc