[MacPorts] #55500: GraphicsMagick @1.3.26: update to 1.3.27

[MacPorts]

#55500: GraphicsMagick @1.3.26: update to 1.3.27
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 Reporter:  l2dy      |      Owner:  ryandesign
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:  security  |       Port:
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 http://www.graphicsmagick.org/NEWS.html#december-9-2017

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Ticket URL: <https://trac.macports.org/ticket/55500>
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