[PATCH] Use arc4random() to permutate talloc_magic number

[Timur I. Bakeyev]

Hi!

I've noticed that talloc testsuite fails on FreeBSD cause talloc_magic is
always a predictable number, derived from the function address of the
loaded library, which is unfortunately always the same(contrary to OpenBSD,
for example). The existing talloc code uses Linux/glibc specific calls to
obtaining random bytes to permutate talloc_magic. *BSD has their own set of
arc4*  functions that can provide cryptographically applicable PRNG.

So, this small patch adds support for the usage of arc4random() to obtain
random talloc_magic signature per invocation.
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