Po-Chuan Hsieh 60deb4485e Fix build with ROCKSDB_LITE and -Wunused-private-field (#4715)
Summary:
The error message of databases/rocksdb-lite (FreeBSD port) is as follows:
```
  tools/db_bench_tool.cc:1976:16: error: private field 'trace_options_' is not used [-Werror,-Wunused-private-field]
    TraceOptions trace_options_;
                 ^
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4715

Differential Revision: D13207902

Pulled By: ajkr

fbshipit-source-id: be3c612eba656aeddb77e35e2f201dd25dc92f7e
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