Fix various compatibility issues with PHP 8

libs/swiftmailer/classes/Swift/SendmailTransport.php

@@ -0,0 +1,45 @@
+<?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.
+ */
+
+/**
+ * SendmailTransport for sending mail through a Sendmail/Postfix (etc..) binary.
+ *
+ * @author Chris Corbyn
+ */
+class Swift_SendmailTransport extends Swift_Transport_SendmailTransport
+{
+    /**
+     * Create a new SendmailTransport, optionally using $command for sending.
+     *
+     * @param string $command
+     */
+    public function __construct($command = '/usr/sbin/sendmail -bs')
+    {
+        call_user_func_array(
+            array($this, 'Swift_Transport_SendmailTransport::__construct'),
+            Swift_DependencyContainer::getInstance()
+                ->createDependenciesFor('transport.sendmail')
+            );
+
+        $this->setCommand($command);
+    }
+
+    /**
+     * Create a new SendmailTransport instance.
+     *
+     * @param string $command
+     *
+     * @return self
+     */
+    public static function newInstance($command = '/usr/sbin/sendmail -bs')
+    {
+        return new self($command);
+    }
+}