(main): Benchmark ripemd-160.

Rev: nettle/examples/nettle-benchmark.c:1.22

examples/nettle-benchmark.c

@@ -601,6 +601,7 @@ main(int argc, char **argv)
       &nettle_sha1, OPENSSL(&nettle_openssl_sha1)
       &nettle_sha224, &nettle_sha256,
       &nettle_sha384, &nettle_sha512,
+      &nettle_ripemd160,
       NULL
     };