CMakeLists BSD licensing
Raised by @arraybolt3:matrix.org:
https://community.kde.org/Policies/Licensing_Policy indicates that BSD-2-Clause should be used for CMakeLists.txt files:
CMake code must be licenced under the BSD-2-Clause license as listed below or the BSD-3-Clause licence as listed below. Note: It is strongly discouraged to use the BSD-3-Clause license.
Clarified that CMake license requirements apply to all CMake code as discussed in 'CMake source files without license' on kde-devel list.
One such file was authored by me, and I'll of course grant permission for it. Two others have copyright headers for @ngraham and @fhek, who will need to authorise such a change.