[MacPorts] #34891: swig: subports do not respect build_arch

[MacPorts]

#34891: swig: subports do not respect build_arch
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 Reporter:  ryandesign@…             |       Owner:  kevin@…           
     Type:  defect                   |      Status:  new               
 Priority:  Normal                   |   Milestone:                    
Component:  ports                    |     Version:  2.1.1             
 Keywords:                           |        Port:  swig              
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Comment(by jwa@…):

 Doesn't happen with me, but then, my build uses clang, curious? Must admit
 that a universal variant could be useful, but no immediate bug is visible.

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Ticket URL: <https://trac.macports.org/ticket/34891#comment:1>
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