util/nvmutil: use arc4random when available

fall back to urandom.

also add a /dev/random fallback, for older unices.

with the posix compatibility changes, combined with
this change as above, the code should be portable
now. i expect it to compile on *many* unix systems!

pretty much everything from the last 30 years.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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