[MacPorts] #66852: cairo, cairo-devel: Update to 1.17.8

[MacPorts]

#66852: cairo, cairo-devel: Update to 1.17.8
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  Reporter:  ryandesign         |      Owner:  mascguy
      Type:  update             |     Status:  assigned
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:
Resolution:                     |   Keywords:
      Port:  cairo cairo-devel  |
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Comment (by lukaso):

 I've started the port here: https://github.com/macports/macports-
 ports/pull/18269

 For now, it's not quite working during my GIMP 2.10 build (dependencies
 are struggling to build, such as py27-cairo). Though no particular
 evidence that it's due to this port.

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Ticket URL: <https://trac.macports.org/ticket/66852#comment:1>
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