[libclc] Fix cross in-tree builds (#97392) When performing cross in-tree builds, we need native versions of various tools, we cannot assume the cross builds that are part of the current build are executable. LLVM provides the setup_host_tool function to handle this, either picking up versions of tools from LLVM_NATIVE_TOOL_DIR, or implicitly building native versions as needed. Use it for libclc too. LLVM's setup_host_tool function assumes the project is LLVM, so this also needs libclc's project() to be conditional on it being built standalone. Luckily, the only change this needs is using CMAKE_CURRENT_SOURCE_DIR instead of PROJECT_SOURCE_DIR.
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