[issue1924] mmap - add mmap offset randomisation

[Alex Hornung (via DragonFly issue tracker)]

Alex Hornung <ahornung at gmail.com> added the comment:

Care to explain the reasoning behind that a bit more? Why is karc4random() 
worse? What are the exact benefit of using the other interface?

I thought karc4random also takes advantage of randomness fed in from devices, 
etc.

Cheers,
Alex

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