cmake.eclass: Add recursive CMakeLists.txt unsupported version detection

We need to ramp up detection of unsupported CMake build systems with
CMake 4. This will detect CMakeLists.txt files setting insufficient
cmake_minimum_required VERSION level even in project subdirectories,
putting out appropriate eqawarn message about the need to fix ${PN}.

That makes us not rely on tinderbox runs w/ unmasked cmake-4 slowly
being able to build everything up to leaf packages, and also helps
detect insufficient subproject minimums that could otherwise be masked
by USE flag choice.

Bug: https://bugs.gentoo.org/951350
Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org>

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