[MacPorts] #42654: cmake: upgrade to 3.0.0

[MacPorts]

#42654: cmake: upgrade to 3.0.0
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  Reporter:  mojca@…  |      Owner:  css@…
      Type:  update   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  cmake    |
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Comment (by egall@…):

 Seeing as 3.0.0 is a major version bump, are there any API changes that
 would require modifications to the cmake portgroup as well?

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Ticket URL: <https://trac.macports.org/ticket/42654#comment:2>
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