[MacPorts] #69009: rb-ruby-debug: mark noarch

[MacPorts]

#69009: rb-ruby-debug: mark noarch
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 Reporter:  jmroot       |      Owner:  randomphrase
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  rb-ruby-debug
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 It looks like this only installs scripts, and so could set
 `supported_archs noarch` and `platforms any`.

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Ticket URL: <https://trac.macports.org/ticket/69009>
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