[MacPorts] #60903: openimageio @2.1.15.0_1: fails to build on macOS 10.11

[MacPorts]

#60903: openimageio @2.1.15.0_1: fails to build on macOS 10.11
------------------------+-------------------------
 Reporter:  jasonliu--  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  openimageio
------------------------+-------------------------
 OpenImageIO was building fine up until just recently. Not really sure
 whether it's due to changes in the source code between version 2.1.14 and
 2.1.15, or some other reason.

 System Info:
 * macOS 10.11.6 15G22010
 * Xcode 8.2.1 8C1002

 I'll attach the build log.

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Ticket URL: <https://trac.macports.org/ticket/60903>
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