CMake versions <3.20.5 contains the following bug:
https://gitlab.kitware.com/cmake/cmake/-/issues/22310
This bug was fixed in CMake 3.20.5:
https://gitlab.kitware.com/cmake/cmake/-/merge_requests/6232
Generally Zephyr can build with CMake >=3.20.0, however the
`cmake/package_helper.cmake` is impacted by the above issue.
Therefore, specifically request CMake >=3.20.5 for package helper
and update documentation to recommend CMake version 3.20.5 in order
to minimize risk of users being impacted by this bug.
Users invoking package helper with CMake 3.20.0-3.20.4 will see:
> CMake Error at cmake/package_helper.cmake:45 (cmake_minimum_required):
> CMake 3.20.5 or higher is required. You are running version 3.20.x
Rest of Zephyr still builds with CMake versions >=3.20.0.
Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>
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