on openbsd, static symbols are not visible from the userland. make mif6table global variable.  (sync with kame)
on openbsd, static symbols are not visible from the userland.
make mif6table global variable.  (sync with kame)

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