[MacPorts] #33596: gnuplot: update to 4.6.0

[MacPorts]

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

Comment(by michaelld@…):

 Ports that require qt4-mac should in general use the qt4 portgroup unless
 there is some good reason to not do so.  It provides and will continue to
 provide "shortcuts" to install locations (e.g., plugins) and other
 directories, and includes qt4-mac and/or -devel correctly.  So, my
 recommendation is to keep using it when possible.  Maybe there are some
 ports where it is not efficient to do so, but I don't remember any off the
 top of my head.

-- 
Ticket URL: <https://trac.macports.org/ticket/33596#comment:28>
MacPorts <http://www.macports.org/>
Ports system for Mac OS