CMake's test suite includes a dashboard build of KWSys directly out of
the CMake source tree. Upstream KWSys switched to a dedicated dashboard
but CMake's test should still submit to the PublicDashboard project.
This converts the KWSys license to a pure 3-clause OSI-approved BSD
License. We drop the previous license clause requiring modified
versions to be plainly marked. We also update the KWSys copyright to
cover the full development time range.