CMake discourages the use of configure_file() to generate files such as
cJSONConfig.cmake because it might expand variables such as
<project>_INCLUDE_DIR to absolute paths, which might cause issues on
Windows and macOS [1].
Instead, configure_package_config_file() is meant as a drop-in
replacement that generates cJSONConfig.cmake using relative paths. In
the context of this project, this should allow pre-compiled versions of
the `3rdParty` directory to be shared among developers.
[1]: https://cmake.org/cmake/help/latest/module/CMakePackageConfigHelpers.html
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