[RocksDB] fix build

Summary: makefile change: LIBRARY => LIBOBJECTS
thanks Abhishek for reproducing this locally.

Test Plan: make release

Reviewers: sheki

CC: leveldb

Task ID: #

Blame Rev:

Makefile

@@ -226,7 +226,7 @@ write_batch_test: db/write_batch_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(CXX) db/write_batch_test.o $(LIBOBJECTS) $(TESTHARNESS) $(EXEC_LDFLAGS) -o $@ $(LDFLAGS)
 
 merge_test: db/merge_test.o $(LIBOBJECTS)
-	$(CXX) db/merge_test.o $(LIBRARY) $(EXEC_LDFLAGS) -o $@ $(LDFLAGS)
+	$(CXX) db/merge_test.o $(LIBOBJECTS) $(EXEC_LDFLAGS) -o $@ $(LDFLAGS)
 
 $(MEMENVLIBRARY) : $(MEMENVOBJECTS)
 	rm -f $@