More than once I forgot to buildkernel, and the vm image scrolls
right past the error which you don't find out till you try to boot
the system. Adding set -e fixes that, BUT when cross building, w/o
qemu, a couple commands fail...

newaliases is now a noop since the switch to dma, and ldconfig appears
to be run at start anyways, so not sure why it's needed here...

built amd64 vm on arm64 and it completed w/o error...