[MacPorts] #36394: gnuplot: update to 4.6.1

[MacPorts]

#36394: gnuplot: update to 4.6.1
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  Reporter:  mojca.miklavec.lists@…  |      Owner:  dports@…
      Type:  update                  |     Status:  closed
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:
Resolution:  fixed                   |   Keywords:  haspatch maintainer
      Port:  gnuplot                 |
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Comment (by raimue@…):

 `patch-docs-Makefile.in.diff` was missing, committed in r98294.

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Ticket URL: <https://trac.macports.org/ticket/36394#comment:6>
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