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Brad King authored
Some host projects no longer set `CMAKE_MACOSX_RPATH` explicitly due to requiring CMake 3.0 or above, and now see CMP0042 warnings. Set the policy explicitly in KWSys to avoid the warnings. Host projects can still set `CMAKE_MACOSX_RPATH` to `0` to get the old behavior. Suggested-by: Ken Martin <ken.martin@kitware.com>
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