Fix error setting --rpc-endpoint in cli_wallet.

It seems that this bug was caused by a change in websocketpp 0.8.0. where they started calling a callback into fc https://gitlab.syncad.com/hive/hive/-/blob/47abb726e5b467b3b4d597d4c2ccaf39f015ec13/libraries/fc/src/network/http/websocket.cpp#L207-210 before we were allowed to set socket options. This commit manually applies this patch: https://github.com/zaphoyd/websocketpp/commit/a4494d5a1ed7de0099556b644b9a3ab975d8584f Fixes #80 (closed)