Tested on amd64, i386 and aarch64 (12.1-STABLE eef4ba7(master) GENERIC arm64
on RPI3)
Ports can be tested on real hardware by setting `GO_PORT=lang/go-devel` (building under qemu-user is currently not possible due to https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240037).