[libcxx-commits] [libcxx] [libcxx] Only use `copy_file_range` on Linux or FreeBSD targets (PR #184373)

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stefson wrote:

@TartanLlama are you maybe able to help out with the proper informations for the last post? I'm not a dev myself, just your average linux user. 

https://github.com/llvm/llvm-project/pull/184373