[MacPorts] #44125: cmake: default values of CMAKE_OSX_SYSROOT/DEPLOYMENT_TARGET (prevent linking against libc++)

[MacPorts]

#44125: cmake: default values of CMAKE_OSX_SYSROOT/DEPLOYMENT_TARGET (prevent
linking against libc++)
---------------------------+--------------------------------
  Reporter:  mojca@…       |      Owner:  macports-tickets@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  cmake libcxx  |
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Comment (by mojca@…):

 I remember that I also had to set `-DCMAKE_OSX_DEPLOYMENT_TARGET=""`, but
 I'm not sure why exactly and I might be wrong. I can check.

 But see also [comment:9:ticket:41318 Ryan's comment]:
 > This should no longer be an issue since the cmake portgroup now always
 sets the SDK.

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Ticket URL: <https://trac.macports.org/ticket/44125#comment:8>
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