[MacPorts] #30600: scon 2.0.1: Update library dependecy to python27

[MacPorts]

#30600: scon 2.0.1: Update library dependecy to python27
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 Reporter:  verwymeren@…          |       Owner:  macports-tickets@…                   
     Type:  update                |      Status:  new                                  
 Priority:  Normal                |   Milestone:                                       
Component:  ports                 |     Version:  2.0.1                                
 Keywords:  scons                 |        Port:  scons                                
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 python27 exists as a package but scons does not provide any option to use
 it over python26.

 To provide support for both:

 * Set library dependency to python 27[[BR]]
 * Provide variants for building with python26[[BR]]

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Ticket URL: <https://trac.macports.org/ticket/30600>
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