[MacPorts] #56398: libvpx @1.7.0: Toolchain is unable to link executables

[MacPorts]

#56398: libvpx @1.7.0: Toolchain is unable to link executables
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  Reporter:  cgilles  |      Owner:  dbevans
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  libvpx   |
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Comment (by kencu):

 For a one-off fix, this ticket is done now, once the OP reports he has it
 installed. For a generic fix for everything, we'd need to ponder whether
 we force `ld64` to always install with the `ld64 +ld64_xcode` variant on
 the new systems (10.13, maybe 10.12, maybe 10.11).

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Ticket URL: <https://trac.macports.org/ticket/56398#comment:5>
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