replace XS_NO_CCB with an iopool around the ecb_pool.
replace XS_NO_CCB with an iopool around the ecb_pool.

take advantage of pool_setipl while here.

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