[MacPorts] #56358: cctools ld64-latest: Add llvm-6.0 support

[MacPorts]

#56358: cctools ld64-latest: Add llvm-6.0 support
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 Reporter:  mf2k         |      Owner:  jeremyhu
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  cctools ld64-latest
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 Now that llvm-6.0 is out, can support for it be added to cctools and
 ld64-latest?

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Ticket URL: <https://trac.macports.org/ticket/56358>
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