[MacPorts] #17418: glib2: update to 2.18.3

[MacPorts]

#17418: glib2: update to 2.18.3
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 Reporter:  ryandesign@…             |       Owner:  ryandesign@…           
     Type:  enhancement              |      Status:  assigned               
 Priority:  Normal                   |   Milestone:  Port Updates           
Component:  ports                    |     Version:  1.7.0                  
 Keywords:                           |        Port:  glib2                  
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Comment(by blb@…):

 Could be like #17258 and #17275.

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Ticket URL: <http://trac.macports.org/ticket/17418#comment:2>
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