test: Update boot universe build architectures

We build lua by default, so we don't need another build to build it
enabled w/o FORTH. That gives little value over the without forth
builds. Remove all mips, they are no longer relevant. Build aarch64
everywhere we build amd64 (except firewire which is x86 only). Build a
few more architectures once so we have at least one of every arch we
support in at least the default build. This should increase coverage
and still take less time than before.

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