[MacPorts] #63261: cmake @3.20.5_1: rpath error when linking any project on 10.4

[MacPorts]

#63261: cmake @3.20.5_1: rpath error when linking any project on 10.4
-------------------------+-----------------------
  Reporter:  evanmiller  |      Owner:  michaelld
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:  tiger
      Port:  cmake       |
-------------------------+-----------------------

Comment (by mojca):

 Just to clarify. If you read the commit comments, that change was needed
 for the sake of proper functionality on iOS.
 So what's needed is basically a condition that only excludes this on
 Tiger, but not on iOS.

 The condition `if("${DARWIN_MAJOR_VERSION}" GREATER 8)` probably returns
 false on iOS where `DARWIN_MAJOR_VERSION` is most likely not defined.

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Ticket URL: <https://trac.macports.org/ticket/63261#comment:13>
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