util/nvmutil: err if arc4random disused on bsd

arc4random is superior, so using /dev/urandom
would be a mistake. we only use that on linux,
or old/weird unix.

we would also use it on linux, but GNU prohibits
nice things (its implementations are spotty, and
old glibc doesn't have it - before 2022 there is
libbsd, but i'm not importing that).

not that it matters. we're not doing encryption.
i'm just a stickler for technical correctness.

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

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