Fixes RocksDB build

oxrocksdb-sys/api/build_version.cc

@@ -3,18 +3,21 @@
 #include <memory>
 
 #include "rocksdb/version.h"
-#include "util/string_util.h"
+#include "rocksdb/utilities/object_registry.h"
+
 
 namespace ROCKSDB_NAMESPACE {
+    std::unordered_map<std::string, RegistrarFunc> ObjectRegistry::builtins_ = {};
+
     const std::unordered_map<std::string, std::string>& GetRocksBuildProperties() {
         static std::unique_ptr<std::unordered_map<std::string, std::string>> props(new std::unordered_map<std::string, std::string>());
         return *props;
     }
 
     std::string GetRocksVersionAsString(bool with_patch) {
-  std::string version = ToString(ROCKSDB_MAJOR) + "." + ToString(ROCKSDB_MINOR);
+        std::string version = std::to_string(ROCKSDB_MAJOR) + "." + std::to_string(ROCKSDB_MINOR);
         if (with_patch) {
-    return version + "." + ToString(ROCKSDB_PATCH);
+            return version + "." + std::to_string(ROCKSDB_PATCH);
         } else {
             return version;
         }
@@ -33,4 +36,3 @@ std::string GetRocksBuildInfoAsString(const std::string& program, bool verbose)
         return info;
     }
 } // namespace ROCKSDB_NAMESPACE
-