Ask CPack to warn each time a file with absolute INSTALL DESTINATION is encountered.
This variable triggers the definition of CMAKE_WARN_ON_ABSOLUTE_INSTALL_DESTINATION when CPack runs cmake_install.cmake scripts.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.12/variable/CPACK_WARN_ON_ABSOLUTE_INSTALL_DESTINATION.html