[MacPorts] #19612: p5-pgplot 1.18 - build error - update to 1.20

[MacPorts]

#19612: p5-pgplot 1.18 - build error - update to 1.20
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 Reporter:  info@…                  |       Owner:  macports-tickets@…                   
     Type:  update                  |      Status:  new                                  
 Priority:  Normal                  |   Milestone:                                       
Component:  ports                   |     Version:  1.7.1                                
 Keywords:                          |        Port:  p5-pgplot                            
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Comment(by info@…):

 The custom patch file `files/patch-Makefile.PL` could also be deleted as
 it has no longer use (they changed the build system)

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Ticket URL: <http://trac.macports.org/ticket/19612#comment:1>
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