(sync with KAME, for possible security reasons)
- fix 64bit alignment issue in routing socket. - avoid s6_addr8 (nonstandard), use s6_addr instead.
rip6query: RIPng query (similar to ripquery) NOTE: we usually do not run route6d on end nodes at startup (rtsol should do the trick). So I figured that route6d can be in /usr/sbin, not in /sbin (routed is in /sbin). Correct me if I'm wrong.