libreboot-utils: simplified pledge/unveil usage

i no longer care about openbsd 5.9. we assume unveil
is available, as has been the case for the past 12
years.

i use wrappers for unveil and pledge, which means that
i call them on every os. on OSes that don't have these,
i just return. it's somewhat inelegant, but also means
that i see errors more easily, e.g. misnamed variables
inside previous ifdef OpenBSD blocks.

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

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