[MacPorts] #44755: gnutls fails to build on ML buildbot (and probably others) due to missing stdnoreturn.h

[MacPorts]

#44755: gnutls fails to build on ML buildbot (and probably others) due to missing
stdnoreturn.h
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  Reporter:  cal@…   |      Owner:  mschamschula@…
      Type:  defect  |     Status:  new
  Priority:  High    |  Milestone:
 Component:  ports   |    Version:  2.3.1
Resolution:          |   Keywords:
      Port:  gnutls  |
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Comment (by mschamschula@…):

 On my systems, I only found this issue under Lion (10.7.5). Both Mountain
 Lion and Mavericks built cleanly.

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Ticket URL: <https://trac.macports.org/ticket/44755#comment:10>
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