[MacPorts] #66188: libsdl2: re-enable universal building i386/x86_64

[MacPorts]

#66188: libsdl2: re-enable universal building i386/x86_64
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  Reporter:  kencu    |      Owner:  jmroot
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  libsdl2  |
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Comment (by Gcenx):

 The 10.12 assumption by QT would have been due to Xcode-8 as that’s the
 first version that supported ARC according to LLVM.

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Ticket URL: <https://trac.macports.org/ticket/66188#comment:15>
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