[MacPorts] #70274: gtk3 @3.24.41_2+quartz: review active_variants check against glib2

[MacPorts]

#70274: gtk3 @3.24.41_2+quartz: review active_variants check against glib2
--------------------------+--------------------
  Reporter:  cooljeanius  |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.9.3
Resolution:               |   Keywords:
      Port:  gtk3         |
--------------------------+--------------------

Comment (by cooljeanius):

 One other reason I can't just install glib2 with `+quartz`: it currently
 fails to build for me with:
 {{{
 Undefined symbols for architecture x86_64:
   "_OBJC_CLASS_$_NSUserNotification", referenced from:
       objc-class-ref in gcocoanotificationbackend.m.o
   "_OBJC_CLASS_$_NSUserNotificationCenter", referenced from:
       objc-class-ref in gcocoanotificationbackend.m.o
 ld: symbol(s) not found for architecture x86_64
 clang: error: linker command failed with exit code 1 (use -v to see
 invocation)
 }}}
 ...which I think is the same basic issue as #67675

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Ticket URL: <https://trac.macports.org/ticket/70274#comment:15>
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