[MacPorts] #27306: sigil: fix arch handling

[MacPorts]

#27306: sigil: fix arch handling
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 Reporter:  ryandesign@…             |       Owner:  krischik@…           
     Type:  defect                   |      Status:  new                  
 Priority:  Normal                   |   Milestone:                       
Component:  ports                    |     Version:  1.9.2                
 Keywords:                           |        Port:  sigil                
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 sigil has a section "platform x86_64". There is no such platform in
 MacPorts so this part of the portfile should be removed. In fact the whole
 way the port deals with architectures should be revisited. Instead of
 platform statements, you should be using ${build_arch} (and if you want to
 support universal builds, ${universal_archs}). The ui_msgs in pre-
 configure should be examined as well and probably removed. You may also
 want to switch to using the cmake portgroup instead of handling cmakeisms
 manually.

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Ticket URL: <https://trac.macports.org/ticket/27306>
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