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

[via libcxx-commits]

stefson wrote:

any chance this can still be merged into the 22.x branch? 

musl was possibly refactored out of the list of if def., all this patch does is to revert back to the original logic. 

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