[MacPorts] #63360: libsdl2: fails to build due to unknown builtin '__builtin_bswap16'

[MacPorts]

#63360: libsdl2: fails to build due to unknown builtin '__builtin_bswap16'
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  Reporter:  mrkapqa  |      Owner:  jmroot
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.7.1
Resolution:           |   Keywords:  lion
      Port:  libsdl2  |
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Comment (by jmroot):

 https://github.com/libsdl-org/SDL/pull/4639

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Ticket URL: <https://trac.macports.org/ticket/63360#comment:6>
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