[MacPorts] #29689: fix inkscape 0.48.1 for x86_64

[MacPorts]

#29689: fix inkscape 0.48.1 for x86_64
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 Reporter:  jjstickel@…        |       Owner:  macports-tickets@…                   
     Type:  defect             |      Status:  new                                  
 Priority:  Normal             |   Milestone:                                       
Component:  ports              |     Version:  1.9.2                                
 Keywords:  x86_64             |        Port:  inkscape                             
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Comment(by jjstickel@…):

 I also added the forgotten '+' for the default variant.  I see a change in
 the naming of the variant(s) is requested in #28303, but I leave that to
 the maintainer to fix separately.

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Ticket URL: <https://trac.macports.org/ticket/29689#comment:1>
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