[racket] runtime determining 32 vs 64 bit machine?

[Danny Yoo]

I'm currently looking at (system-type 'machine) to determine whether
I'm on a 32-bit vs 64-bit machine.  However, the strings I'm getting
are a bit too platform specific, and I'm resorting to matching the
string "64" somewhere in there.  Is there a nicer way to approach
this?
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