fix: add CMake as a build requirement only if required #1031
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The PyPI distribution of CMake shall not be listed as an unconditional build requirement. It shall only be added as a build requirement if not installed or too low a version. This helps building from sources on platforms where no wheels are available for CMake but the system already provides a recent enough CMake version. In case of error checking the version, the backend falls back to using the PyPI distribution of CMake.
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The PyPI distribution of CMake shall not be listed as an unconditional build requirement. It shall only be added as a build requirement if not installed or too low a version.
This helps building from sources on platforms where no wheels are available for CMake but the system already provides a recent enough CMake version. Adress the comment in #793 (comment).
In case of error checking the version, the backend falls back to using the PyPI distribution of CMake.