message: Fix block deserialization in benchmark
diff: @@ -21,7 +21,7 @@ static void DeserializeBlockTest(benchmark::State& state)
  {
  CDataStream stream((const char*)block_bench::block413567,
  (const char*)&block_bench::block413567[sizeof(block_bench::block413567)],
  - SER_NETWORK, PROTOCOL_VERSION);
  + SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_BLOCK_LEGACY);
  char a = '\0';
  stream.write(&a, 1); // Prevent compaction
  @@ -36,7 +36,7 @@ static void DeserializeAndCheckBlockTest(benchmark::State& state)
  {
  CDataStream stream((const char*)block_bench::block413567,
  (const char*)&block_bench::block413567[sizeof(block_bench::block413567)],
  - SER_NETWORK, PROTOCOL_VERSION);
  + SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_BLOCK_LEGACY);
  char a = '\0';
  stream.write(&a, 1); // Prevent compaction
  