[MacPorts] #56724: webkit2-gtk @2.20.3+quartz fails to build on OS X 10.11

[MacPorts]

#56724: webkit2-gtk @2.20.3+quartz fails to build on OS X 10.11
--------------------------+-----------------------
  Reporter:  EdHarry      |      Owner:  jeremyhu
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.5.2
Resolution:               |   Keywords:  elcapitan
      Port:  webkit2-gtk  |
--------------------------+-----------------------

Comment (by kencu):

 exposing this in the Portfile
 {{{
 configure.args-append -DUSE_GSTREAMER_GL=OFF
 }}}
 does allow `webkit2-gtk +quartz` to build through to completion on
 `10.13`.  I'm not certain if there is a more elegant mechanism to
 accomplish the build, but for now that will work. Unless something more
 narrow shows up, we can just have that set for all the `+quartz` builds.

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Ticket URL: <https://trac.macports.org/ticket/56724#comment:5>
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