[MacPorts] #55317: gmsh won't build with xcode 9.1

[MacPorts]

#55317: gmsh won't build with xcode 9.1
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 Reporter:  dershow  |      Owner:
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  gmsh
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 I just upgraded to OS 10.13 and migrated.  Now gmsh will not build.
 However, I tried to xcode-select to use xcode 8.3.3 and that does allow it
 to build.  So, it fails with 9.1

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Ticket URL: <https://trac.macports.org/ticket/55317>
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