[clang] Build the Z3 mock module via CMake (#146284) Build the Z3 mock module via CMake rather than compiling it directly in tests. This ensures that the toolchain file is exported, and therefore fixes testing for Gentoo multilib. Also, it ensures that the module is compiled only once for the two tests using it. While at it, remove the related Z3 include directory and host compiler substitutions -- they are not used anymore, and the latter can't be reliably used in tests. The code is based on the existing bits for CTTestTidyModule. See https://github.com/llvm/llvm-project/pull/145731#issuecomment-3015197983
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