Add some include guards

Change-Id: If306f95f206e2b1cba48df806c822b8e2d27cf72
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/android/avdmanageroutputparser.h

@@ -1,6 +1,8 @@
 // Copyright (C) 2021 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
+#pragma once
+
 #include "androiddeviceinfo.h"
 
 namespace Android {

src/plugins/cmakeprojectmanager/projecttreehelper.h

@@ -1,6 +1,8 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
+#pragma once
+
 #include "cmakeprojectnodes.h"
 
 #include <utils/filepath.h>

src/plugins/python/pythonwizardpage.h

@@ -1,6 +1,8 @@
 // Copyright (C) 2022 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
+#pragma once
+
 #include <projectexplorer/jsonwizard/jsonwizard.h>
 #include <projectexplorer/jsonwizard/jsonwizardpagefactory.h>
 #include <projectexplorer/runconfigurationaspects.h>

src/plugins/silversearcher/silversearcherparser_test.h

@@ -1,6 +1,8 @@
 // Copyright (C) 2017 Przemyslaw Gorszkowski <pgorszkowski@gmail.com>.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
+#pragma once
+
 #include <QObject>
 
 namespace SilverSearcher {

src/tools/buildoutputparser/outputprocessor.h

@@ -1,6 +1,8 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
+#pragma once
+
 #include <QObject>
 
 QT_BEGIN_NAMESPACE