[MacPorts] #65550: julia: link fails for 10.14 and earlier: ld: unsupported tapi file type '!tapi-tbd' in YAML file

[MacPorts]

#65550: julia: link fails for 10.14 and earlier: ld: unsupported tapi file type
'!tapi-tbd' in YAML file
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  Reporter:  githubbjs  |      Owner:  essandess
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.7.2
Resolution:             |   Keywords:
      Port:  julia      |
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Comment (by benz0li):

 Cross reference: https://github.com/JuliaLang/julia/issues/49976
 (Alternative to copying part of a recent Xcode `libSystem.tbd` to
 `src/mach_dyld_atfork.tbd`)

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Ticket URL: <https://trac.macports.org/ticket/65550#comment:18>
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