fix LITE build

Summary: Broken by optimistic transaction diff.  (I only built 'release' not 'static_lib' when testing).

Test Plan: build

Reviewers: yhchiang, sdong, igor

Reviewed By: igor

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D39219

db/db_impl.cc

@@ -3164,11 +3164,13 @@ Status DBImpl::Write(const WriteOptions& write_options, WriteBatch* my_batch) {
   return WriteImpl(write_options, my_batch, nullptr);
 }
 
+#ifndef ROCKSDB_LITE
 Status DBImpl::WriteWithCallback(const WriteOptions& write_options,
                                  WriteBatch* my_batch,
                                  WriteCallback* callback) {
   return WriteImpl(write_options, my_batch, callback);
 }
+#endif  // ROCKSDB_LITE
 
 Status DBImpl::WriteImpl(const WriteOptions& write_options,
                          WriteBatch* my_batch, WriteCallback* callback) {