Use SPDX license identifiers

Replace the current license disclaimer in files by
a SPDX-License-Identifier.

Task-number: QTBUG-67283
Change-Id: I708fd1f9f2b73d60f57cc3568646929117825813
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

scripts/build.py

@@ -1,31 +1,6 @@
 #!/usr/bin/env python3
-#############################################################################
-##
-## Copyright (C) 2020 The Qt Company Ltd.
-## Contact: https://www.qt.io/licensing/
-##
-## This file is part of the release tools of the Qt Toolkit.
-##
-## $QT_BEGIN_LICENSE:GPL-EXCEPT$
-## Commercial License Usage
-## Licensees holding valid commercial Qt licenses may use this file in
-## accordance with the commercial license agreement provided with the
-## Software or, alternatively, in accordance with the terms contained in
-## a written agreement between you and The Qt Company. For licensing terms
-## and conditions see https://www.qt.io/terms-conditions. For further
-## information use the contact form at https://www.qt.io/contact-us.
-##
-## GNU General Public License Usage
-## Alternatively, this file may be used under the terms of the GNU
-## General Public License version 3 as published by the Free Software
-## Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
-## included in the packaging of this file. Please review the following
-## information to ensure the GNU General Public License requirements will
-## be met: https://www.gnu.org/licenses/gpl-3.0.html.
-##
-## $QT_END_LICENSE$
-##
-#############################################################################
+# Copyright (C) 2020 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0 WITH Qt-GPL-exception-1.0
 
 # import the print function which is used in python 3.x
 from __future__ import print_function