Add licensing information for files missing it.
Some files are under LGPL v2 (without an option for any later version), so include the full LGPL v2. I used the version in kdelibs/licenses however, not the version attached to the review request, as our copy has been updated to reflect the FSF's preferred wording (Lesser vs. Library, etc.) COPYING-CMAKE-SCRIPTS is also added for FindFAM.cmake, and other CMake scripts that might follow without including their own license info. REVIEW:122764
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