[MacPorts] #28327: boost does not follow build_arch

[MacPorts]

#28327: boost does not follow build_arch
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 Reporter:  andrebragareis@…          |       Owner:  adfernandes@…           
     Type:  defect                    |      Status:  new                     
 Priority:  Normal                    |   Milestone:                          
Component:  ports                     |     Version:  1.9.2                   
 Keywords:                            |        Port:  boost                   
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Comment(by andrebragareis@…):

 Works flawlessly, thank you! I can't vouch for the PPC part, but it looks
 good to send upstream.
 Many thanks.

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Ticket URL: <https://trac.macports.org/ticket/28327#comment:3>
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