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Clear options on the context.
void clear_options( options o, asio::error_code & ec);
This function may be used to configure the SSL options used by the context.
                  A bitmask of options. The available option values are defined in
                  the ssl::context_base class. The
                  specified options, if currently enabled on the context, are cleared.
                
Set to indicate what error occurred, if any.
            Calls SSL_CTX_clear_options.