Correct license for build system files

According to QUIP-18 [1], all build system
files should be BSD-3-Clause

[1]: https://contribute.qt-project.org/quips/18

Pick-to: 6.7
Task-number: QTBUG-121787
Change-Id: I2f13ceaa8eb68b7745cffc66651f892c1fbeeff2
Reviewed-by: Kai Köhne <[email protected]>

Author: lugerard

.clang-format

@@ -1,5 +1,5 @@
 # Copyright (C) 2016 Olivier Goffart <[email protected]>
-# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+# SPDX-License-Identifier: BSD-3-Clause
 
 # This is the clang-format configuration style to be used by Qt,
 # based on the rules from https://wiki.qt.io/Qt_Coding_Style and

src/host/config.tests/hostcompiler/main.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2018 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+// SPDX-License-Identifier: BSD-3-Clause
 
 #include <stdio.h>
 int main()

tests/auto/core/getdomainandregistry/CMakeLists.txt

@@ -1,5 +1,5 @@
 # Copyright (C) 2022 The Qt Company Ltd.
-# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+# SPDX-License-Identifier: BSD-3-Clause
 
 include(../../util/util.cmake)
 

tests/auto/widgets/qtbug_110287/CMakeLists.txt

@@ -1,5 +1,5 @@
 # Copyright (C) 2022 The Qt Company Ltd.
-# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+# SPDX-License-Identifier: BSD-3-Clause
 
 qt_internal_add_test(tst_qtbug_110287
     SOURCES

tests/manual/widgets/touchbrowser/CMakeLists.txt

@@ -1,5 +1,5 @@
 # Copyright (C) 2022 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
+# SPDX-License-Identifier: BSD-3-Clause
 
 if (NOT QT_BUILD_STANDALONE_TESTS AND NOT QT_BUILDING_QT)
     cmake_minimum_required(VERSION 3.19)

tests/manual/widgets/webrtc/CMakeLists.txt

@@ -1,5 +1,5 @@
 # Copyright (C) 2023 The Qt Company Ltd.
-# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+# SPDX-License-Identifier: BSD-3-Clause
 
 if (NOT QT_BUILD_STANDALONE_TESTS AND NOT QT_BUILDING_QT)
     cmake_minimum_required(VERSION 3.19)