[MacPorts] #54663: gnutls @3.5.15_0 fails to build on macOS 10.13

[MacPorts]

#54663: gnutls @3.5.15_0 fails to build on macOS 10.13
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 Reporter:  rex4539     |      Owner:
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.4.99
 Keywords:  highsierra  |       Port:  gnutls
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Ticket URL: <https://trac.macports.org/ticket/54663>
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