[MacPorts] #32949: drop dependency on gtk2, so librsvg can be made a dependency of gtk2

[MacPorts]

#32949: drop dependency on gtk2, so librsvg can be made a dependency of gtk2
------------------------------+---------------------------------------------
 Reporter:  cal@…             |       Owner:  pixilla@…           
     Type:  enhancement       |      Status:  new                 
 Priority:  Normal            |   Milestone:                      
Component:  ports             |     Version:  2.0.3               
 Keywords:                    |        Port:  librsvg             
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 librsvg is required for gtk2 applications to show SVG icons. However,
 librsvg cannot be made a dependency of gtk2, because librsvg depends on
 gtk2.

 However, librsvg seems to build just fine without gtk2, so could you
 please consider dropping this dependency?

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Ticket URL: <https://trac.macports.org/ticket/32949>
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