add posix_madvise, posix_memalign, strndup, and strnlen.  mostly from brad and millert, with hints from guenther, jmc, and otto I think. ok previous.
add posix_madvise, posix_memalign, strndup, and strnlen.  mostly from
brad and millert, with hints from guenther, jmc, and otto I think.
ok previous.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars