[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 barracuda156):

 In fact, without the testsuite (which is broken by `-export_dynamic` flag
 `gtk4` builds fine for me on 10.6 with zero manual efforts. No new patches
 etc.
 ```
 36-25% port -v installed gtk4
 The following ports are currently installed:
   gtk4 @4.10.4_0+x11 (active) requested_variants='' platform='darwin 10'
 archs='ppc' date='2023-08-18T15:48:12+0800'
 ```

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Ticket URL: <https://trac.macports.org/ticket/67977#comment:10>
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