[MacPorts] #29303: gant fixes: noarch, remove unnecessary lines, use notes (was: gant is noarch)

[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@…):

 Not in the attached patch, but you should also remove `extract.post_args |
 gnutar -x` from the `platform darwin` section: it does nothing (MacPorts
 overwrites `extract.post_args` when the extract phase begins) and isn't
 correct (this distfile is a zip file, not a tar file).

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Ticket URL: <https://trac.macports.org/ticket/29303#comment:1>
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