[MacPorts] #67231: libjxl 0.8.1_0: build fails: compilation errors in enc_fast_lossless.cc

[MacPorts]

#67231: libjxl 0.8.1_0: build fails: compilation errors in enc_fast_lossless.cc
----------------------+----------------------
 Reporter:  ddissett  |      Owner:  jmroot
     Type:  defect    |     Status:  assigned
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.8.1
 Keywords:            |       Port:  libjxl
----------------------+----------------------
 building:: libjxl @0.8.1_0
  macOS:: 10.14.6 (18G9323)
  Xcode:: Version 11.3.1 (11C505)

 produces errors starting at
 work/libjxl-0.8.1/lib/jxl/enc_fast_lossless.cc:3768 that are beyond my
 limited macOS development knowledge to debug.

 please see attached build log

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Ticket URL: <https://trac.macports.org/ticket/67231>
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