CI: WIP NetBSD/vax build using simh #140

Job	Run time
build-netbsd (NetBSD/amd64 10.1 with pkgsrc)	2m 15s
build-linux qemu (386)	3m 49s
build-netbsd (NetBSD/vax 10.1 with pkgsrc and simh)	13m 29s
build-linux qemu (arm)	4m 1s
build-linux (ubuntu:22.04)	34s
build-linux qemu (arm64)	6m 57s
build-linux (ubuntu:latest)	43s
build-linux (debian:12)	31s
build-linux (debian:11)	28s
build-linux (archlinux:base)	38s
build-linux (almalinux:8)	43s
build-linux (almalinux:9)	35s
build-linux (opensuse/leap)	1m 9s
build-linux (fedora:40)	38s
build-linux (fedora:41)	35s
	37m 5s

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