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In commit da5ac4bb (cpack: Add `CPACK_INSTALL_CMAKE_CONFIGURATIONS` variable, 2019-07-10, v3.16.0-rc1~165^2) we added both the variable and support for `cpack -C` with multiple configurations. Drop the variable because the `package` target cannot ensure that all of the configurations are built. Keep the command-line interface so that it can be used manually in scripts. Fixes: #19918
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