[MacPorts] #67977: gtk4: build fails with gcc, due to use of '-export_dynamic'

[MacPorts]

#67977: gtk4: build fails with gcc, due to use of '-export_dynamic'
---------------------------+----------------------
  Reporter:  barracuda156  |      Owner:  mascguy
      Type:  defect        |     Status:  reopened
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:
      Port:  gtk4          |
---------------------------+----------------------

Comment (by jmroot):

 `-Wl,` is the mechanism provided by the compiler front-end to pass flags
 to the linker.

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Ticket URL: <https://trac.macports.org/ticket/67977#comment:8>
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