Improve Apple Silicon Mac support #1289
Merged
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Following on from #1237, with new discoveries!
Turns out that in many cases, Apple Silicon Macs will in fact run Bash in amd64 mode, which in turn means the reported architecture is amd64, even though it's an Apple Silicon Mac. Homebrew has worked around this in Homebrew/brew#7995, and we more or less follow their lead here.
This makes it so that we always show our little notice on Apple Silicon Macs, whether their shell is in amd64 or arm64 mode.