lbutils makefile: use c99 in strict mode

not c90

i use stdint now on a few files. i had this
idea in my head to use C89 for some reason,
but this is pointless.

c99 however is worthy as a minimum, because
for example, compilers like tcc will adhere
to its spec (for the most part), so this is
the minimum reasonable requirement on modern
unix systems.

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

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