[clang] [clang][CMake] Fix clangSupport_tablegen ODR violation with LLVM_LINK_LLVM_DYLIB (PR #186672)

[Alexis Engelke via cfe-commits]

https://github.com/aengelke commented:

But now clangSupport source files get built needlessly twice?

https://github.com/llvm/llvm-project/pull/186672