🏗 Add xdelta3 dependency

lib/xdelta3/cpp-btree/btree_test_flags.cc

@@ -0,0 +1,20 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "gflags/gflags.h"
+
+DEFINE_int32(test_values, 10000,
+             "The number of values to use for tests.");
+DEFINE_int32(benchmark_values, 1000000,
+             "The number of values to use for benchmarks.");