[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):

 Copy/paste from the old issue


  https://clang.llvm.org/docs/AutomaticReferenceCounting.html#evolution
  {{{
  ARC applies to Objective-C pointer types, block pointer types, and
  [beginning Apple 8.0, LLVM 3.8] BPTRs declared within extern "BCPL"
  blocks.
  }}}

  That would line up with QT requirement of 10.12 for 32Bit ARC as macOS
  Sierra shipped with Xcode-8.
  https://wiki.qt.io/Apple_Platforms_Coding_Conventions

-- 
Ticket URL: <https://trac.macports.org/ticket/66188#comment:10>
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