[MacPorts] #61864: ld64: add llvm10 and llvm11 variants

[MacPorts]

#61864: ld64: add llvm10 and llvm11 variants
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  Reporter:  ryandesign   |      Owner:  jeremyhu
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:               |
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Changes (by kencu):

 * port:  ld64 =>


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Ticket URL: <https://trac.macports.org/ticket/61864#comment:1>
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