[MacPorts] #38083: gtk3: use require_active_variants like gtk2 does

[MacPorts]

#38083: gtk3: use require_active_variants like gtk2 does
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  Reporter:  ryandesign@…  |      Owner:  cal@…
      Type:  enhancement   |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.1.3
Resolution:  fixed         |   Keywords:  haspatch
      Port:  gtk3          |
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Comment (by ryandesign@…):

 I forgot that for awhile too :P

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Ticket URL: <https://trac.macports.org/ticket/38083#comment:2>
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