[MacPorts] #33596: gnuplot: update to 4.6.0

[MacPorts]

#33596: gnuplot: update to 4.6.0
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 Reporter:  mojca.miklavec.lists@…          |       Owner:  macports-tickets@…                   
     Type:  update                          |      Status:  new                                  
 Priority:  Normal                          |   Milestone:                                       
Component:  ports                           |     Version:  2.0.4                                
 Keywords:                                  |        Port:  gnuplot                              
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Comment(by mojca.miklavec.lists@…):

 In the light of planned changes to upgrade qt4-mac to Qt 4.8 in a couple
 of days there is no reason to care about "PortGroup qt4" any more. A
 simple dependency on qt4-mac will do.

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Ticket URL: <https://trac.macports.org/ticket/33596#comment:27>
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