Pawel Jakub Dawidek 72de35d0a7 Prefer sysctl to open/read/close for obtaining random data.
This method is more sandbox-friendly and also should be faster as only
one syscall is needed instead of three.
In case of an error fall back to the old method.

Reviewed by:	simon, gleb
MFC after:	2 weeks
2012-07-04 19:51:25 +00:00
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