[CMake] Revert to LLVM_LIBRARY_DIR in clingutils for builtin_clang=OFF #18407
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Following up one 02b0dc1, using again
LLVM_LIBRARY_DIRinstead ofLLVM_DIRin case ofbuiltin_clang=OFFand whenCLANG_INSTALL_PREFIXwas not set by the users. TheLLVM_DIRvariable is only a user hint tofind_package(LLVM).See also the discussion in #18386 (comment).