[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@…):

 The PortGroup needs a bunch of changes actually. But not because of the
 version bump. There are things that MacPorts does suboptimally, including:
   * always specifying the architecture, so that Fortran compiler gets
 `-arch x86_64` flag and subsequently nothing works (also CMake's problem,
 but MacPorts could avoid that)
   * don't add `-I/opt/local/include` to `CXXFLAGS`
   * automatically build out-of-source (maybe that's something that should
 be supported globally in MacPorts)
   * not so much a problem of the PortGroup, but maybe we need more patches
 to allow easier discovery of different packages (FindX11 still found files
 from /usr in some cases for example)
   * etc.

 Anyway, I'll use that version from now on and I'll see if I bump into any
 problem. If any problems arise, I suspect the problems would be in CMake
 files provided by individual software, not so much with the PortGroup.

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Ticket URL: <https://trac.macports.org/ticket/42654#comment:4>
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