www/hs-http-client-restricted: import hs-http-client-restricted-0.1.0

Addition to the http-client and http-client-tls libraries, that restricts
the HTTP servers that can be used.

This is useful when a security policy needs to eg, prevent connections to
HTTP servers on localhost or a local network, or only allow connections to
a specific HTTP server.

It handles restricting redirects as well as the initial HTTP connection,
and it also guards against DNS poisoning attacks.

(pho)