[MacPorts] #59084: nghttp2 does not build since updating to Xcode 11

[MacPorts]

#59084: nghttp2 does not build since updating to Xcode 11
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  Reporter:  ksze     |      Owner:  Schamschula
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.6.0
Resolution:           |   Keywords:  build, mojave, xcode
      Port:  nghttp2  |
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Comment (by jmroot):

 The build system needs to pass along CFLAGS in the environment when
 running setup.py, since it contains the correct -isysroot flag.

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Ticket URL: <https://trac.macports.org/ticket/59084#comment:4>
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