Support MacOS on amd64

[ghost]

I'm getting the error "QEMU binary not found" despite having installed qemu using Homebrew. I see that the instruction set is hard coded as aarch64 for darwin.

Are you open for pull requests to support arm64 on darwin, or is that considered a dead platform? Personally, I'm fine either way. Will use a rejection as evidence to request a new MacBook. :)

[cgwalters]

Are you open for pull requests to support [amd64] on darwin

I can't speak for everyone else maintaining things here but: Yeah, probably.

[germag]

I'm ok with it, but my only concern is we don't have resources to test it on old macs