[MacPorts] #18643: Support for the no_x11 variant in the giflib Portfile

[MacPorts]

#18643: Support for the no_x11 variant in the giflib Portfile
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 Reporter:  adambyrtek@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement           |      Status:  new                                  
 Priority:  Normal                |   Milestone:  Port Updates                         
Component:  ports                 |     Version:  1.7.0                                
 Keywords:                        |        Port:  giflib                               
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 Currently giflib depends upon X11 libraries, this is not strictly required
 so I've added support for the no_x11 variant. Diff to the Portfile is
 attached to this ticket.

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Ticket URL: <http://trac.macports.org/ticket/18643>
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