[MacPorts] #66852: cairo, cairo-devel: Update to 1.18.0

[MacPorts]

#66852: cairo, cairo-devel: Update to 1.18.0
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  Reporter:  ryandesign         |      Owner:  mascguy
      Type:  update             |     Status:  assigned
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:  2.8.1
Resolution:                     |   Keywords:
      Port:  cairo cairo-devel  |
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Comment (by kencu):

 meson most often does the rpath fiddling correctly….builds with rpaths,
 supports testing, then rewrites them to final paths on install.

 cmake does not, because the cmake PG tells the build to use final libpaths
 during the build, and this breaks the testing unless that is turned off.
 We should have fixed that years ago, btw.

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Ticket URL: <https://trac.macports.org/ticket/66852#comment:14>
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