httpclient: import 4bb625347d4a to provide SSL wrapper injection This lets us inject our own ssl.wrap_socket equivalent into httpclient, which means that any changes we make to our ssl handling can be *entirely* on our side without having to muck with httpclient, which sounds appealing. For example, an extension could wrap sslutil.ssl_wrap_socket with an api-compatible wrapper and then tweak SSL settings more precisely or use GnuTLS instead of OpenSSL.