Fix various compatibility issues with PHP 8

libs/swiftmailer/classes/Swift/RfcComplianceException.php

@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * This file is part of SwiftMailer.
+ * (c) 2004-2009 Chris Corbyn
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * RFC Compliance Exception class.
+ *
+ * @author Chris Corbyn
+ */
+class Swift_RfcComplianceException extends Swift_SwiftException
+{
+    /**
+     * Create a new RfcComplianceException with $message.
+     *
+     * @param string $message
+     */
+    public function __construct($message)
+    {
+        parent::__construct($message);
+    }
+}