License headers: use SPDX-FileCopyrightText for CMake files

tests/gtests/CMakeLists.txt

@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2014-2022 Blender Foundation
+#
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 if(WITH_GTESTS)

tests/gtests/runner/CMakeLists.txt

@@ -1,5 +1,6 @@
+# SPDX-FileCopyrightText: 2020 Blender Foundation
+#
 # SPDX-License-Identifier: GPL-2.0-or-later
-# Copyright 2020 Blender Foundation
 
 # Build the test runner. This runner takes care of running all GTests, i.e.
 # the code that was built using the blender_add_test_lib() CMake macro (see

tests/gtests/testing/CMakeLists.txt

@@ -1,5 +1,6 @@
+# SPDX-FileCopyrightText: 2014 Blender Foundation
+#
 # SPDX-License-Identifier: GPL-2.0-or-later
-# Copyright 2014 Blender Foundation
 
 add_definitions(${GFLAGS_DEFINES})
 add_definitions(${GLOG_DEFINES})