[MacPorts] #70080: Make supported archs none implied by platforms any

[MacPorts]

#70080: Make supported archs none implied by platforms any
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  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  base          |    Version:  2.9.3
Resolution:                |   Keywords:
      Port:                |
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Comment (by jmroot):

 Neither one is a necessary or sufficient condition for the other. The
 current default is safer because not setting these options when they
 should be set is a performance problem, but setting them when they should
 not be set is a correctness problem.

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Ticket URL: <https://trac.macports.org/ticket/70080#comment:2>
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