[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@…):

 I would be perfectly happy to use PortGroup qt4, but unless somebody can
 figure out why installation doesn't end up with a binary in
 /opt/local/bin/gnuplot, an explicit dependence on qt4-mac seems to be the
 only option for now. I don't know enough about internals of macports to be
 able to "debug".

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Ticket URL: <https://trac.macports.org/ticket/33596#comment:29>
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