[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 kencu):

 Replying to [comment:4 jmroot]:

 > Did the system clang ever start allowing `-fobjc-arc` together with
 `-arch i386`? The report that prompted the change was on 10.9.

 So far, not up to 10.10 at least:
 {{{
 $ /usr/bin/clang -fobjc-arc -arch i386 writeback.m
 error: -fobjc-arc is not supported on platforms using the legacy runtime
 VM1010Yosemite:~ cunningh$ /usr/bin/clang -v
 Apple LLVM version 7.0.2 (clang-700.1.81)
 Target: x86_64-apple-darwin14.5.0
 Thread model: posix
 VM1010Yosemite:~ cunningh$ /usr/bin/clang -fobjc-arc -arch i386
 writeback.m
 error: -fobjc-arc is not supported on platforms using the legacy runtime
 }}}

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Ticket URL: <https://trac.macports.org/ticket/66188#comment:6>
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