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cxxmodules: give transitive usages to Clang as well

Ben Boeckel requested to merge ben.boeckel/cmake:module-mapper-clang-transitive into master

In the future, Clang plans to require transitive module usage to be specified on the command line. This is in order to keep BMI files more reproducible. Handily, MSVC has already required this, so the logic can be reused for Clang easily.

See: https://github.com/llvm/llvm-project/commit/e22fa1d4c6152d36cf1342ab9029adc97c79a310
See: https://github.com/llvm/llvm-project/issues/62707
See: https://discourse.llvm.org/t/c-20-modules-should-the-bmis-contain-paths-to-their-dependent-bmis/70422

Edited by Brad King

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