[MacPorts] #52128: ld64: don't add unsupported subports

[MacPorts]

#52128: ld64: don't add unsupported subports
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  Reporter:  mojca        |      Owner:  jeremyhu
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  ld64         |
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Comment (by jmroot):

 Sometimes defining subports and sometimes not causes a number of problems.
 They should be defined everywhere and set known_fail to avoid buildbot
 failure messages.

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Ticket URL: <https://trac.macports.org/ticket/52128#comment:5>
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