CDRIVER-1691 blindly uses O_NOFOLLOW, which isn't universally supported.
We should ifdef it and only use if defined.
See also https://groups.google.com/forum/#!topic/mongodb-user/YRNvo_ZwPHs
- is related to
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CDRIVER-1691 /dev/shm/mongoc-${PID} is created in an insecure manner
- Closed