[MacPorts] #48131: oxygen-gtk2, oxygen-gtk3: move common code out of subports

[MacPorts]

#48131: oxygen-gtk2, oxygen-gtk3: move common code out of subports
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  Reporter:  ryandesign@…              |      Owner:  rjvbertin@…
      Type:  enhancement               |     Status:  new
  Priority:  Normal                    |  Milestone:
 Component:  ports                     |    Version:  2.3.99
Resolution:                            |   Keywords:  haspatch
      Port:  oxygen-gtk2, oxygen-gtk3  |
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Comment (by rjvbertin@…):

 better fix for the engine filename extension issue. From the looks of it,
 this is how all GTk style engines are built on my system (i.e. as
 "bundles").

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Ticket URL: <https://trac.macports.org/ticket/48131#comment:1>
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