fix compile warnings

[jsteemann]

Fixes lots of compile warnings related to missing override specifiers, e.g.

./3rdParty/rocksdb/trace_replay/block_cache_tracer.h:130:10: warning: ‘virtual rocksdb::Status rocksdb::BlockCacheTraceWriterImpl::WriteBlockAccess(const rocksdb::BlockCacheTraceRecord&, const rocksdb::Slice&, const rocksdb::Slice&, const rocksdb::Slice&)’ can be marked override [-Wsuggest-override]
  130 |   Status WriteBlockAccess(const BlockCacheTraceRecord& record,
      |          ^~~~~~~~~~~~~~~~
./3rdParty/rocksdb/trace_replay/block_cache_tracer.h:136:10: warning: ‘virtual rocksdb::Status rocksdb::BlockCacheTraceWriterImpl::WriteHeader()’ can be marked override [-Wsuggest-override]
  136 |   Status WriteHeader();
      |          ^~~~~~~~~~~

[ajkr]

LGTM

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