Remove Lasso < 2.3 compatibility code.

Since our minimum ersion is 2.4, this is essentially dead code.
It was missed in the earlier cleanups because other compatibility
code used ifdefs instead of this construct.

auth_mellon_handler.c

@@ -1182,45 +1182,6 @@ static int am_init_logout_request(request_rec *r, LassoLogout *logout)
 
     profile = LASSO_PROFILE(logout);
 
-    /* We need to set the SessionIndex in the LogoutRequest to the SessionIndex
-     * we received during the login operation. This is not needed since release
-     * 2.3.0.
-     */
-    if (lasso_check_version(2, 3, 0, LASSO_CHECK_VERSION_NUMERIC) == 0) {
-        session = lasso_profile_get_session(profile);
-        assertion_list = lasso_session_get_assertions(
-            session, profile->remote_providerID);
-        if(! assertion_list ||
-                        LASSO_IS_SAML2_ASSERTION(assertion_list->data) == FALSE) {
-            AM_LOG_RERROR(APLOG_MARK, APLOG_ERR, 0, r,
-                          "No assertions found for the current session.");
-            lasso_logout_destroy(logout);
-            return HTTP_INTERNAL_SERVER_ERROR;
-        }
-        /* We currently only look at the first assertion in the list
-         * lasso_session_get_assertions returns.
-         */
-        assertion_n = assertion_list->data;
-
-        assertion = LASSO_SAML2_ASSERTION(assertion_n);
-
-        /* We assume that the first authnStatement contains the data we want. */
-        authnStatement = LASSO_SAML2_AUTHN_STATEMENT(assertion->AuthnStatement->data);
-
-        if(!authnStatement) {
-            AM_LOG_RERROR(APLOG_MARK, APLOG_ERR, 0, r,
-                          "No AuthnStatement found in the current assertion.");
-            lasso_logout_destroy(logout);
-            return HTTP_INTERNAL_SERVER_ERROR;
-        }
-
-        if(authnStatement->SessionIndex) {
-            request = LASSO_SAMLP2_LOGOUT_REQUEST(profile->request);
-            request->SessionIndex = g_strdup(authnStatement->SessionIndex);
-        }
-    }
-
-
     /* Set the RelayState parameter to the return url (if we have one). */
     if(return_to) {
         profile->msg_relayState = g_strdup(return_to);