[MacPorts] #42654: cmake: upgrade to 3.0.0

[MacPorts]

#42654: cmake: upgrade to 3.0.0
---------------------+-------------------
 Reporter:  mojca@…  |      Owner:  css@…
     Type:  update   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  cmake
---------------------+-------------------
 This is a preliminary request to test `cmake 3.0.0-rc1` before that
 version gets officially released (and to upgrade to 3.0.0 once it gets
 released).

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