Zcash: Excluding change to `BlockWitnessMerkleRoot` as we don't have
SegWit (deploying non-malleable txs via ZIP 244 instead).
(cherry picked from commit bitcoin/bitcoin@1f0e7ca09c)
Zcash: Commented out second BENCHMARK argument as we haven't backported
the benchmark refactor that adds it.
(cherry picked from commit bitcoin/bitcoin@0df017889b)