[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:  closed
  Priority:  Normal        |  Milestone:
 Component:  base          |    Version:  2.9.3
Resolution:  wontfix       |   Keywords:
      Port:                |
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Comment (by jmroot):

 Actually I did just think of an example: libgcc. It doesn't install any
 arch-specific files itself, but arch checking needs to be done
 transitively from its dependents to its dependencies, so it must not be
 treated as noarch.

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Ticket URL: <https://trac.macports.org/ticket/70080#comment:6>
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