[MacPorts] #28794: gnuplot: Add cairo variant

[MacPorts]

#28794: gnuplot: Add cairo variant
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 Reporter:  kthenriksson@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement             |      Status:  new                                  
 Priority:  Normal                  |   Milestone:                                       
Component:  ports                   |     Version:  1.9.2                                
 Keywords:                          |        Port:  gnuplot                              
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 The gnuplot program has support for alternate terminals for png and pdf
 output provided by the cairo library. I prefer these terminals over the
 older ones, but cairo is disabled at the moment. This updated portfile for
 gnuplot adds a cairo variant which enables these terminals.

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Ticket URL: <https://trac.macports.org/ticket/28794>
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