Zhongyi Xie 92b1a68d87 fix FreeBSD build
Summary:
Currently FreeBSD build is broken in master and possibly some previous releases due to unrecognized symbol `O_DIRECT`.
This PR will fix the build on FreeBSD
Closes https://github.com/facebook/rocksdb/pull/3560

Differential Revision: D7148646

Pulled By: miasantreble

fbshipit-source-id: 95b6c3d310fa531267c086b2cd40a5ab1c042b5a
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