[MacPorts] #66167: libsdl2 +universal fails on 10.9

[MacPorts]

#66167: libsdl2 +universal fails on 10.9
----------------------+--------------------
  Reporter:  Gcenx    |      Owner:  jmroot
      Type:  defect   |     Status:  closed
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.8.0
Resolution:  fixed    |   Keywords:
      Port:  libsdl2  |
----------------------+--------------------

Comment (by Gcenx):

 I don’t think this should be the solution

 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

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Ticket URL: <https://trac.macports.org/ticket/66167#comment:3>
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