Revert "Don't compile ldb tool into static library"

This reverts commit e296577ef6.

include/rocksdb/ldb_tool.h

@@ -0,0 +1,18 @@
+// Copyright (c) 2013, Facebook, Inc.  All rights reserved.
+// This source code is licensed under the BSD-style license found in the
+// LICENSE file in the root directory of this source tree. An additional grant
+// of patent rights can be found in the PATENTS file in the same directory.
+#ifndef STORAGE_ROCKSDB_INCLUDE_LDB_TOOL_H
+#define STORAGE_ROCKSDB_INCLUDE_LDB_TOOL_H
+#include "rocksdb/options.h"
+
+namespace rocksdb {
+
+class LDBTool {
+ public:
+  void Run(int argc, char** argv, Options = Options());
+};
+
+} // namespace rocksdb
+
+#endif // STORAGE_ROCKSDB_INCLUDE_LDB_TOOL_H