* getaddrinfo.c (shared/netbsd/openbsd/freebsd4)   query DNS only once per an AF.
* getaddrinfo.c (shared/netbsd/openbsd/freebsd4)
  query DNS only once per an AF.

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame