fixup! session server UPDATE make thread running flag atomic

Author: Roytak

src/session_p.h

@@ -795,7 +795,6 @@ struct nc_server_opts {
 #ifdef NC_ENABLED_SSH_TLS
     char *authkey_path_fmt;             /**< Path to users' public keys that may contain tokens with special meaning. */
     char *pam_config_name;              /**< PAM configuration file name. */
-    char *ssh_protocol_string;          /**< SSH protocol identification string. */
     int (*interactive_auth_clb)(const struct nc_session *session, ssh_session ssh_sess, ssh_message msg, void *user_data);
     void *interactive_auth_data;
     void (*interactive_auth_data_free)(void *data);