SConstruct : Added BOOST_CMAKE option to support Boost that was built with CMake.

[boberfly]

Generally describe what this PR will do, and why it is needed.

• Added BOOST_CMAKE option to support Boost that was built with CMake. With some built libraries like ::system and ::regex, these tend to be 'stub' builds to a more or less header-only library, and so CMake builds tend to retain being header-only for some reason. So this option right now only just excludes those two libraries from being specified. I'm able to build Cortex this way with Boost 1.82 built with CMake from: https://github.com/boostorg/boost/releases/tag/boost-1.82.0

Related Issues

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Dependencies

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Breaking Changes

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Checklist

• I have read the contribution guidelines.
• I have updated the documentation, if applicable.
• I have tested my change(s) in the test suite, and added new test cases where necessary.
• My code follows the Cortex project's prevailing coding style and conventions.