[MacPorts] #70137: gtk4: "No provider of glGenSamplers found" error on older systems

[MacPorts]

#70137: gtk4: "No provider of glGenSamplers found" error on older systems
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  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.9.3
Resolution:                |   Keywords:
      Port:  gtk4          |
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Comment (by barracuda156):

 Ok, I will make a PR to add a note until it is fixed, otherwise it is
 nowhere obvious and makes an impression that it is just completely
 defunct.

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Ticket URL: <https://trac.macports.org/ticket/70137#comment:7>
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