disable lbutils on non-linux systems

i should probably test musl as well, on linux

libreboot-utils is stable on the glibc systems i tested
with linux. it is quite buggy on bsd systems.

it's irresponsible to let users compile this until i've
properly tested the code. putting this error in for now.

i made lbmk use the old nvmutil version for now, and retro
fitted several improvements to i/o there from lbutils,
changes that i know are stable on bsd.

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

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