[cmake] Use SSE4.2 optimized CRC32 in leveldb is available
[cmake] Use SSE4.2 optimized CRC32 in leveldb is available

Summary: As per title.

Test Plan:
  ninja all check-leveldb

Reviewers: #bitcoin_abc, schancel

Reviewed By: #bitcoin_abc, schancel

Subscribers: teamcity

Differential Revision: https://reviews.bitcoinabc.org/D1327

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