Fix websocketpp based on https://github.com/LocutusOfBorg/websocketpp/commit/1dd07113f2a7489444a8990a95be42e035f8e9df so that this benchmark can be compiled against libssl1.1-dev
- [DH] gdax-orderbook-hpp/demo/dependencies/websocketpp-0.7.0/websocketpp/transport/asio/security/tls.hpp