Removal of support for systems without /dev/urandom.

[Ira Cooper]

This is a patch to clean up 2 Coverity issues that really pointed at a
larger issue in our code base.

The code used for seeding the random number generator, without
/dev/urandom, is not currently insecure, but it is time to deal with it
before it becomes so.

I've put a check into waf to break configure if it can not find
/dev/urandom.  If you defeat that, you will run into a #error compiling
without /dev/urandom.  If you get past all that... you get what you deserve
;).

I hope that is sufficient to warn people about the change.

Code is enclosed,

-Ira
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