[MacPorts] #56301: webkit2-gtk @2.14.2_2+quartz: fails to build under 10.13.4

[MacPorts]

#56301: webkit2-gtk @2.14.2_2+quartz: fails to build under 10.13.4
--------------------------+----------------------
  Reporter:  aque         |      Owner:  jeremyhu
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.4.3
Resolution:               |   Keywords:
      Port:  webkit2-gtk  |
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Comment (by ryandesign):

 We've seen this `dyld: Symbol not found: __cg_jpeg_resync_to_restart`
 error many times before (e.g. #36621), but not with webkit2-gtk, and it's
 usually been because `DYLD_LIBRARY_PATH` was set to an incorrect value. I
 see two instances of `DYLD_LIBRARY_PATH` being set in the log, but the
 value it's being set to looks ok to me (specifically, it doesn't contain
 /opt/local/lib).

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Ticket URL: <https://trac.macports.org/ticket/56301#comment:2>
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