wasm: QWebSocketServer doesn't start

Trying to create and start a QWebSocketServer causes this error:

QNativeSocketEngine::initialize unable to inline out-of-band data

and get serverError of QWebSocketProtocol::CloseCodeAbnormalDisconnection

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We do not use native sockets for wasm, and I see there is no wasm functions for QWebSocketServer.

Should we support this? I am not sure we even can. If not, we might error/assert straight away or even at compile time.