[MacPorts] #69117: harfbuzz fails to compile on 10.5

[MacPorts]

#69117: harfbuzz fails to compile on 10.5
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  Reporter:  rmottola  |      Owner:  ryandesign
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  leopard
      Port:  harfbuzz  |
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Comment (by rmottola):

 I attached a patch that works fine for me. Same principle. It should be
 upstreamable, but also fine to apply unconditionally in macports?

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Ticket URL: <https://trac.macports.org/ticket/69117#comment:4>
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