[MacPorts] #52495: webkit2-gtk @2.14.0+quartz: undefined symbols error under Sierra

[MacPorts]

#52495: webkit2-gtk @2.14.0+quartz: undefined symbols error under Sierra
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  Reporter:  aque         |      Owner:  devans
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.4
Resolution:               |   Keywords:
      Port:  webkit2-gtk  |
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Comment (by jeremyhu):

 devans reproduced in #52688, so he can probably figure out the fix.  I'm
 not sure why the change I made didn't address the problem, but we should
 just be disabling WebGL support on +quartz.  Can you investigate how to do
 that and why the r154013 change didn't have that effect?

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Ticket URL: <https://trac.macports.org/ticket/52495#comment:13>
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