[MacPorts] #30781: Small change to qt4-mac and qt4-mac-devel Portfiles

[MacPorts]

#30781: Small change to qt4-mac and qt4-mac-devel Portfiles
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 Reporter:  carsomyr@…          |       Owner:  michaelld@…           
     Type:  defect              |      Status:  new                   
 Priority:  Normal              |   Milestone:                        
Component:  ports               |     Version:  2.0.99                
 Keywords:  haspatch            |        Port:  qt4-mac, qt4-mac-devel
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Comment(by jmr@…):

 That whole thing is actually unnecessary. If you're not on Darwin, it's
 going to produce a nonsense MDT from os.version, and if you are on Darwin,
 macosx_deployment_target is always set.

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Ticket URL: <https://trac.macports.org/ticket/30781#comment:2>
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