FreeBSD's GETNAMEINFO(3) says:
> If a link-layer address or UNIX-domain address is passed to
> getnameinfo(), its ASCII representation will be stored in host. The
> string pointed to by serv will be set to the empty string if non-NULL;
> flags will always be ignored.
Android seems to behave like FreeBSD.
* This reverts commit df9521fd04:
"Remove failing spec files"
* Platform guards follow in the next commits.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64452 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
