[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:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.1.3
 Keywords:  haspatch      |       Port:  gtk3
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 I fixed gtk2 to use require_active_variants. Then I wanted to make gtk3 do
 the same. Then I realized gtk3 was already using require_active_variants
 but slightly differently.

 This patch updates gtk3 to do it the way gtk2 now does.

 There is a slight change in behavior: previously, gtk3+quartz could not be
 installed if pango+quartz+x11 was installed; it required pango+quartz
 (without +x11). Was this restriction necessary? If not, we should remove
 it, as in the attached patch. If the restriction really was necessary, I'm
 guessing we should add it to gtk2 as well.

 There was no corresponding restriction for +x11. The port already allowed
 gtk3+x11 to be installed if pango+quartz+x11 was installed, and this patch
 doesn't change that.

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