[MacPorts] #39608: cmake: update to 2.8.11.2

[MacPorts]

#39608: cmake: update to 2.8.11.2
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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 mojca@…):

 I would also be grateful if someone could address #37732. In the meantime
 I understand a bit more about {{{PortGroups}}}, but I'm not sure about the
 best possible "user interface"/variable/behaviour.

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Ticket URL: <https://trac.macports.org/ticket/39608#comment:5>
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