[MacPorts] #67263: supertuxkart @1.4: builds fail for 10.12 and earlier: IOSurface/IOSurfaceRef.h not found

[MacPorts]

#67263: supertuxkart @1.4: builds fail for 10.12 and earlier:
IOSurface/IOSurfaceRef.h not found
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  Reporter:  mascguy       |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:
      Port:  supertuxkart  |
---------------------------+--------------------

Comment (by jmroot):

 MoltenVK isn't going to work on OS versions that don't have Metal,
 however.

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Ticket URL: <https://trac.macports.org/ticket/67263#comment:2>
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