Add missing header guards

Task-number: QTBUG-109394
Pick-to: 6.5 6.4 6.2
Change-Id: Idc5b0057d41186c8dfd7e752fe819ebebc6f8859
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

src/plugins/networkinformation/networklistmanager/qnetworklistmanagerevents.h

@@ -1,6 +1,9 @@
 // Copyright (C) 2021 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
+#ifndef QNETWORKLISTMANAGEREVENTS_H
+#define QNETWORKLISTMANAGEREVENTS_H
+
 #include <QtNetwork/private/qtnetworkglobal_p.h>
 
 #include <QtNetwork/qnetworkinformation.h>
@@ -73,3 +76,5 @@ private:
 };
 
 QT_END_NAMESPACE
+
+#endif // QNETWORKLISTMANAGEREVENTS_H

src/tools/qlalr/recognizer.h

@@ -1,6 +1,9 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
+#ifndef RECOGNIZER_H
+#define RECOGNIZER_H
+
 #include "grammar_p.h"
 
 #include "lalr.h"
@@ -72,3 +75,5 @@ protected:
   QString _M_current_value;
   bool _M_no_lines;
 };
+
+#endif // RECOGNIZER_H