too small

pointed out by todd@

ok, deraadt@

ok miod@

thanks to nick@openbsd.org for finding this
thanks to nick@openbsd.org, drahn@openbsd.org, and lurene@daemonkitty.net
for testing on short notice!

As requested by deraadt@

Tested by various people on various platforms, I'm willing to fix any
breakage this causes.
ok niels@ deraadt@ and mickey@ (after his comments were applied)

make -> ${MAKE}
add phony targets
remove unnecessary subshells
install kernel in a separate target from building.
some SUDO.
okay deraadt@
(checked bootstrap on i386, should be safe elsewhere, and trivial to fix
anyways)

No changes in the generated output, so no regen needed.
ok todd@

crashes sh, EVEN after that possible fix.  It appears to overflow the
ramdisk _before_ it dumps core.  Noone was shown these changes.  They were
just tossed in.  This is not a development process that will work, so I
am just backing out all the changes in the last 24 hours.