[MacPorts] #18054: glib2: update to 2.18.4

[MacPorts]

#18054: glib2: update to 2.18.4
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 Reporter:  devans@…             |       Owner:  ryandesign@…           
     Type:  enhancement          |      Status:  new                    
 Priority:  Normal               |   Milestone:  Port Updates           
Component:  ports                |     Version:  1.7.0                  
 Keywords:                       |        Port:  glib2                  
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 Attached patch updates glib2 to version 2.18.4 as well as adding a missing
 build dependency on gtk-doc which was revealed in the process of
 attempting to install in a fresh install of MacPorts.

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Ticket URL: <http://trac.macports.org/ticket/18054>
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