[MacPorts] #69317: supported_archs noarch prevents CMake from setting correct flags

[MacPorts]

#69317: supported_archs noarch prevents CMake from setting correct flags
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  Reporter:  barracuda156        |      Owner:  (none)
      Type:  defect              |     Status:  new
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:  2.9.1
Resolution:                      |   Keywords:
      Port:  cmake, cmake-devel  |
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Comment (by jmroot):

 You're free to set configure.build_arch to $build_arch (or any other value
 you like) if the default isn't suitable in your "multiple scenarios" that
 involve not building for a native arch.

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Ticket URL: <https://trac.macports.org/ticket/69317#comment:1>
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