[MacPorts] #32927: Update gimp2-devel from 2.7.3 to 2.7.4

[MacPorts]

#32927: Update gimp2-devel from 2.7.3 to 2.7.4
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 Reporter:  blender3dartist@…          |       Owner:  devans@…           
     Type:  update                     |      Status:  new                
 Priority:  Normal                     |   Milestone:                     
Component:  ports                      |     Version:                     
 Keywords:                             |        Port:  gimp2-devel        
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Comment(by blender3dartist@…):

 This should be 2.8 RC 1, now.

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Ticket URL: <https://trac.macports.org/ticket/32927#comment:4>
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