link, symlink: throw error if operation fails and nargout == 0 (bug #57830). * dirfns.cc (Flink, Fsymlink): Rename "err" to "status" in documentation. Document that status variable is -1 if an error is encountered. Add nargout to DEFUN macro invocation. Based on nargout variable, either throw an error if operation failed, or return status and msg information.

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