[MacPorts] #61775: mame: 0.226 build fails on 10.8, due to host libstdc++ bug (_DARWIN_C_SOURCE needs to be defined)

[MacPorts]

#61775: mame: 0.226 build fails on 10.8, due to host libstdc++ bug
(_DARWIN_C_SOURCE needs to be defined)
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  Reporter:  mascguy  |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  High     |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  mame     |
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Comment (by mascguy):

 Note: Source patch may be slightly more specific, and only be enabled when
 both `__APPLE__` and `_XOPEN_SOURCE` are defined. But still TBD.

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Ticket URL: <https://trac.macports.org/ticket/61775#comment:1>
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