[MacPorts] #53531: libart_lgpl @2.3.21: Don't create flat-namespace dylib on Yosemite

[MacPorts]

#53531: libart_lgpl @2.3.21: Don't create flat-namespace dylib on Yosemite
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  Reporter:  ryandesign   |      Owner:  tobypeterson
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  libart_lgpl  |
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Comment (by tobypeterson):

 Go for it, feel free to make the port openmaintainer while you're at it.
 (github PRs are preferable, don't require me to be on my laptop...)

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Ticket URL: <https://trac.macports.org/ticket/53531#comment:1>
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