gethostbyname removal from lws get peer addresses

This replaces gethostbyname in libwebsockets_get_peer_addresses and
in the client handshake path.

There's one left in lws-plat-win but that can be done another time.

Let's see how much damage that did to the cross-platform and option
builds...

Signed-off-by: Andy Green <andy.green@linaro.org>