[MacPorts] #67977: gtk4 uses Linux flags on Mac which breaks the build

[MacPorts]

#67977: gtk4 uses Linux flags on Mac which breaks the build
---------------------------+---------------------
  Reporter:  barracuda156  |      Owner:  mascguy
      Type:  defect        |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:  invalid       |   Keywords:
      Port:  gtk4          |
---------------------------+---------------------
Changes (by mascguy):

 * status:  assigned => closed
 * resolution:   => invalid


-- 
Ticket URL: <https://trac.macports.org/ticket/67977#comment:2>
MacPorts <https://www.macports.org/>
Ports system for macOS