it's easy to allow bpfwrites bigger than MCLBYTES now that we have large cluster pools and MCLGETI.
it's easy to allow bpfwrites bigger than MCLBYTES now that we have
large cluster pools and MCLGETI.

we could chain mbufs if we want to go even bigger.

with a fix from Mathieu- <naabed at poolp dot org>

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