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Since commit 4b2a61946f (FindBoost: Honor BOOST_ROOT when finding
upstream BoostConfig, 2020-10-22, v3.19.0-rc2~14^2) we accidentally leak
our internal setting of `Boost_ROOT`. Revise the logic to unset our
temporary value.
Fixes: #21379
See the "Find Modules" section of the cmake-developer(7) manual page. For more information about how to contribute modules to CMake, see this page: https://gitlab.kitware.com/cmake/community/-/wikis/doc/cmake/dev/Module-Maintainers