[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 mojca@…):

 Replying to [ticket:52128 mojca@…]:
 >
 > I would like to request removal of subports that are not supported on a
 particular OS. Not that this is a problem in practice (not sure why users
 would intentionally try to install an unsupported dependency)

 I was slightly wrong here. Unsupported variants (or subports for that
 matter) are also a problem for users who upgrade. This was a problem for
 `ld64_latest +llvm33` or `+llvm34` that triggered errors. It's probably
 not a problem in this specific case, but I still believe that it would be
 nice to only list and allow supported variants and subports.

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Ticket URL: <https://trac.macports.org/ticket/52128#comment:2>
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