[build-script] Avoid stripping clang builtin .a libraries when extracting dSYMs on Darwin #71986
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Clang builtins (.a libraries inside lib/swift/clang/lib/darwin) are sometimes problematic to strip (because stripping .a/.o files involves calling the linker) and it's somewhat wrong to strip them in the first place (because they get consumed into linked products which might want to still extract dSYMs but if the .a is already stripped, then debug info for the .a content is already lost). Let's avoid stripping Clang builtins.
rdar://123844745