[MacPorts] #29303: gant fixes: noarch, remove unnecessary lines, use notes

[MacPorts]

#29303: gant fixes: noarch, remove unnecessary lines, use notes
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 Reporter:  ryandesign@…             |       Owner:  breskeby@…           
     Type:  defect                   |      Status:  new                  
 Priority:  Normal                   |   Milestone:                       
Component:  ports                    |     Version:  1.9.2                
 Keywords:  haspatch                 |        Port:  gant                 
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Comment(by ryandesign@…):

 You added "supported_archs noarch" in r78331; I've attached a revised
 patch with the remaining changes.

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Ticket URL: <https://trac.macports.org/ticket/29303#comment:2>
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