Throw exception or stop the listener when SSL used but compiled without WITH_OPENSSL=1

[AxcelVoid]

There also seems to be no warnings/errors if uWS is compiled without "WITH_OPENSSL=1" . It compiles and executes without using an ssl context even when the code tells it to.

Originally posted by @yuumikazoomi in https://github.com/uNetworking/uWebSockets/issues/1132#issuecomment-800413035

[ghost]

It's kind of a core feature that TLS and TCP have the same interface, so your app doesn't have to be rewritten when moving to TLS. uWebSockets doesn't know whether or not uSockets is compiled with SSL or not.

uSockets just default to TCP if not compiled with SSL

[ghost]

You could make it so that uSockets fails of requested to do SSL without supporting it

[uNetworkingAB]

int us_protocol_support (int)

Could be checked in listen and just print a different message as a hint