[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'
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  Reporter:  barracuda156  |      Owner:  mascguy
      Type:  defect        |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:  fixed         |   Keywords:
      Port:  gtk4          |
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Comment (by barracuda156):

 Thank you! I will see later how to get rid of that flag for tests when
 using GCC, but at least the port is buildable by default now, which is
 great.

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Ticket URL: <https://trac.macports.org/ticket/67977#comment:13>
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