[MacPorts] #47508: nghttp2: build failure on 10.6

[MacPorts]

#47508: nghttp2: build failure on 10.6
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 Reporter:  ionic@…  |      Owner:  mschamschula@…
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  nghttp2
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 As happened on the buildslaves after updating to 0.7.12.

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Ticket URL: <https://trac.macports.org/ticket/47508>
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