CMD: Run ED25519 signing test only when OpenSSL version is compatible

tool/yubico-piv-tool.c

@@ -2074,7 +2074,7 @@ static bool test_signature(ykpiv_state *state, enum enum_slot slot,
           }
         }
         break;
-#if (OPENSSL_VERSION_NUMBER < 0x10100000L) || defined(LIBRESSL_VERSION_NUMBER)
+#if (OPENSSL_VERSION_NUMBER >= 0x10100000L)
       case YKPIV_ALGO_ED25519:
         {
           EVP_MD_CTX *ctx;