[MacPorts] #20739: Allow ports to indicate supported architectures

[MacPorts]

#20739: Allow ports to indicate supported architectures
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 Reporter:  ryandesign@…             |       Owner:  macports-tickets@…                   
     Type:  enhancement              |      Status:  new                                  
 Priority:  Normal                   |   Milestone:  MacPorts Future                      
Component:  base                     |     Version:  1.7.1                                
 Keywords:                           |        Port:                                       
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Comment(by jmr@…):

 Option added in r64372.

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Ticket URL: <http://trac.macports.org/ticket/20739#comment:7>
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