_callback", referenced from:   _context_init in stunnel-ctx.o "_TLSv0_0_client_method", referenced from:   _parse_service_option in stunnel-options.o "_TLSv0_0_server_method", referenced from:   _parse_service_option in stunnel-options.o "_TLSv0_0_client_method", referenced from:   _parse_service_option in stunnel-options.o "_TLSv0_0_server_method", referenced from:   _parse_service_option in stunnel-options.o "_