[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 mojca@…):

 CMake 3.0 has been released. I attached a patch for the upgrade.

 Unrelated to the upgrade itself: I also removed a check for existence of
 `configure.cxx_stdlib` (now that MacPorts 2.3.0 is out), but I'm actually
 curious why the following code is needed at all:
 {{{
 platform darwin 11 {
     # TODO: Figure out why using libc++ fails.
     #       Since nothing links against cmake and cmake is just using
     #       the STL, we're safe to force libstdc++
     configure.cxx_stdlib libstdc++
 }
 }}}
 Isn't `libsttdc++` default on darwin 11 anyway?

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Ticket URL: <https://trac.macports.org/ticket/42654#comment:13>
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