Don't attempt to support IPv4-mapped IPv6 addresses.

We don't consider support for those addreses as desirable, so let's not
give a bad example by keeping application code to handle them.  This is
dead code on OpenBSD anyway since we do not support IPv4-mapped stuff.
But let's keep the check to log and warn the admin if the code gets
ported elsewhere.  Porters of this code should ensure that IPv6 sockets
can't see IPv4-mapped addresses by using the IPV6_V6ONLY sockopt.

Discussed with & ok tedu@

For a rationale, see https://tools.ietf.org/html/draft-itojun-v6ops-v4mapped-harmful-02

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