[MacPorts] #62822: gmake @4.3_0+universal: build error on BigSur arm64

[MacPorts]

#62822: gmake @4.3_0+universal: build error on BigSur arm64
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  Reporter:  kode54  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.4
Resolution:          |   Keywords:
      Port:  gmake   |
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Comment (by ryandesign):

 Ok right, of course. So only one of `__i386__` or `__x86_64__` or
 `__arm__` or `__arm64__` should be defined at a time. So we need to figure
 out what is causing `__arm__` or `__arm64__` to be defined when building
 the x86_64 part.

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Ticket URL: <https://trac.macports.org/ticket/62822#comment:12>
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