[MacPorts] #13834: Update to gnome-session 2.20.2

[MacPorts]

#13834: Update to gnome-session 2.20.2
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 Reporter:  guido.soranzio at gmail.com  |       Owner:  macports-tickets at lists.macosforge.org
     Type:  enhancement               |      Status:  new                                  
 Priority:  Normal                    |   Milestone:  Port Updates                         
Component:  ports                     |     Version:  1.6.0                                
 Keywords:                            |  
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 - Depends on gnome-control-center, not control-center

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/13834>
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