s/MP/UP/ kernels were otherwise in place.
in my testing on a U60, i couldn't really notice any different in
speed, but we need testing on a U1/U5/U10 systems to be sure that
GENERIC.UP isn't necessary.
for sparc64, this is some what required as USIIIi systems have the
memory controller on the CPU, and unless the CPU is spunup, a UP
kernel will not function on these systems. (we obviously need to
join the NUMA-for-netbsd camp now, too! :-)
this should enable the installer to function on all systems that we
support, but also give the option for people to install GENERIC.UP
on their single-cpu systems if they choose.
XXX: i haven't actually tested sysinst with this, but i have built
both sparc and sparc64 release iso's successfully with this change
(sans having to comment out kern_ctf.c.)