Provide information found in CH even when it is too old #311
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…pported_versions`. `legacy_version` is checked after determining the TLS version
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This PR makes sure that the on_client_hello callback is called even when TLS handshake fails due to the CH being incompatible with TLS 1.3.
A new flag, called
ptls_on_client_hello_parameters_t::incompatible_versionis added to the parameter set passed to the callback, so that the callback can make decisions based on if picotls is going to consume the ClientHello.