fast_io.rs: use sendfile or splice if copy_file_range is not supported - #459

fast_io.rs: use sendfile or splice if copy_file_range is not supported#459

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Franklin-Qi:fix-#443-use-sendfile-or-splice-if-copy-file-range-is-not-supportedFranklin-Qi/sed:fix-#443-use-sendfile-or-splice-if-copy-file-range-is-not-supportedCopy head branch name to clipboard