Revert "Merge branch 'hellfish' of https://github.com/netzbasis/openbsd-src into hellfish"

This reverts commit ad3458178e176049d8b9f16baab2338d7138fdc3, reversing
changes made to 7e9a460cc22a4832b3799e657f0e02ca56b25e95.
Revert "Merge branch 't-page_zeroing' into hellfish"

This reverts commit 1ab813197adc67bc5d2e1a96a2a4ca87117ac0aa, reversing
changes made to ad3458178e176049d8b9f16baab2338d7138fdc3.