[MacPorts] #72096: m4 won't build for build_arch x86_64 on ARM machine

[MacPorts]

#72096: m4 won't build for build_arch x86_64 on ARM machine
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  Reporter:  ehrmann  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  m4       |
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Changes (by jmroot):

 * port:   => m4


Comment:

 Related to #71120 but opposite. Looks like it's adding `#define __arm__ 1`
 early on, maybe in the "checking host CPU and C ABI" step.

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Ticket URL: <https://trac.macports.org/ticket/72096#comment:4>
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