Import www/php-http2 3.0.1 (the PHP 7 variant of www/php-http).

This HTTP extension aims to provide a convenient and powerful
set of functionality for one of PHPs major applications.

It eases handling of HTTP urls, dates, redirects, headers and
messages, provides means for negotiation of clients preferred
language and charset, as well as a convenient way to send any
arbitrary data with caching and resuming capabilities.

(fhajny)