[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 mascguy):

 Replying to [comment:4 mascguy]:
 > Upstream has a pending merge request with a fix, though it needs to be
 tweaked to ensure correct versioning. Spent a few minutes on that earlier
 today, but it's not quite right yet. (And will submit a revised patch,
 once it's been perfected.)

 Okay, the dylib versioning patch is all set.

 But builds fail for 10.7 and earlier. Hopefully it won't require much
 work, but still need to dig into it further.

 Making progress...

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Ticket URL: <https://trac.macports.org/ticket/66852#comment:7>
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