[MacPorts] #43738: gnuplot: upgrade to 5.0

[MacPorts]

#43738: gnuplot: upgrade to 5.0
----------------------+----------------------
  Reporter:  mojca@…  |      Owner:  mojca@…
      Type:  update   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:  haspatch
      Port:  gnuplot  |
----------------------+----------------------

Comment (by devans@…):

 A few lint problems
 {{{
 $ port lint --nitpick
 --->  Verifying Portfile for gnuplot
 Error: Line 8 repeats inclusion of PortGroup xcodeversion
 Warning: Line 87 has trailing whitespace before newline
 Warning: Dependency path:lib/pkgconfig/pango.pc:pango specified multiple
 times in depends_lib
 --->  1 errors and 2 warnings found.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/43738#comment:6>
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