[MacPorts] #71396: libheif fails building with target 10.14

[MacPorts]

#71396: libheif fails building with target 10.14
------------------------+--------------------
  Reporter:  MStraeten  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.10.5
Resolution:             |   Keywords:  10.14
      Port:  libheif    |
------------------------+--------------------
Changes (by MStraeten):

 * Attachment "main.log" added.


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Ticket URL: <https://trac.macports.org/ticket/71396>
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