[MacPorts] #36327: vala: update to 0.18.0

[MacPorts]

#36327: vala: update to 0.18.0
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 Reporter:  anatol.pomozov@…  |      Owner:  macports-tickets@…
     Type:  update            |     Status:  new
 Priority:  Normal            |  Milestone:
Component:  ports             |    Version:
 Keywords:  haspatch          |       Port:  vala
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 subj!

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Ticket URL: <https://trac.macports.org/ticket/36327>
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