cleanRootPath used filepath.Abs which prepends the current directory,
but the resulting absolute path does not always refer to the same
directory as the original relative path - for example when the current
directory is shadowed by a mount or has been removed. This made
"rclone copy --links . ../dst" fail where "cp -ra . ../dst" succeeds.
rclone now cleans the path lexically on non-Windows platforms instead,
leaving relative roots relative so the OS resolves them against the live
working directory. Windows still makes the path absolute as required for
UNC long-path conversion.
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