librsvg: Add gdk-pixbuf2 dependency

[Robson Roberto Souza Peixoto]

Please, check this ticket
http://trac.macports.org/ticket/37399

-- 
Robson Roberto Souza Peixoto
Robinho
Master in Computer Science, University of Campinas
Linux Counter #395633
IRC: robsonpeixoto
Twitter: http://twitter.com/rrspba
github: https://github.com/robsonpeixoto
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