(main): Benchmark sha224.

Rev: nettle/examples/nettle-benchmark.c:1.7

examples/nettle-benchmark.c

@@ -388,7 +388,8 @@ main(int argc, char **argv)
       &nettle_md2, &nettle_md4, &nettle_md5,
       OPENSSL(&nettle_openssl_md5)
       &nettle_sha1, OPENSSL(&nettle_openssl_sha1)
-      &nettle_sha256, &nettle_sha384, &nettle_sha512,
+      &nettle_sha224, &nettle_sha256,
+      &nettle_sha384, &nettle_sha512,
       NULL
     };