[MacPorts] #49324: ghostscript @9.16_1: update to 9.18

[MacPorts]

#49324: ghostscript @9.16_1: update to 9.18
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  Reporter:  mschamschula@…  |      Owner:  macports-tickets@…
      Type:  update          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.3.4
Resolution:                  |   Keywords:  haspatch
      Port:  ghostscript     |
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Comment (by mschamschula@…):

 The updated diff file also deals with #49357 - a stealth update @ github.

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Ticket URL: <https://trac.macports.org/ticket/49324#comment:2>
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