[MacPorts] #40394: dragonegg-3.3-*, dragonegg-3.4-*: pass -stdlib to build

[MacPorts]

#40394: dragonegg-3.3-*, dragonegg-3.4-*: pass -stdlib to build
----------------------+-----------------------------------------
 Reporter:  larryv@…  |      Owner:  jeremyhu@…
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.2.99
 Keywords:            |       Port:  dragonegg-3.3 dragonegg-3.4
----------------------+-----------------------------------------
 Building the subports for `dragonegg-3.3` and `dragonegg-3.4` fails with
 linking errors when I have `cxx_stdlib` set. Passing `-stdlib` allows it
 to complete.

 The older DragonEgg ports successfully build as they are, but they end up
 linking to libstdc++. This change actually causes them to fail.

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Ticket URL: <https://trac.macports.org/ticket/40394>
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