renameat has been deprecated in favor of renameat2 for new ports.  This
allows the audit tests to build on RISC-V.
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NOlof Johansson <olof@lixom.net>
Signed-off-by: NPalmer Dabbelt <palmer@sifive.com>