[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 jeremyhu@…):

 Yeah, I was think that as well, but I left it alone since I wasn't sure
 how to safely do it.

 This is consistent with the way we exclude full ports that are not
 supported on a particular OS (older gcc versions, etc), how should we
 exclude those?

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Ticket URL: <https://trac.macports.org/ticket/52128#comment:3>
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