feat: improve robustness of linking with clang path checks #280
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The case which made the setup of
nsld.sh
problematic was with the known/reported issues with Metal on Xcode 26.https://stackoverflow.com/questions/79660070/xcode-26-metal-compiler-error-metaltoolchain
https://www.reddit.com/r/swift/comments/1lfice9/xcode_cloud_26_doesnt_have_metal_toolchain/
Some projects will have transients that include it and will fail the build during this build script.
It can be ignored when not found, which allows project to build/operate as normal.
This change will link if the path exists, otherwise will skip and log that it skipped it with directory path logged for further debugging if needed.