[MacPorts] #63485: mozjs60 @60.8.0: fails due to no i386 atomics available when building with clang-9.0

[MacPorts]

#63485: mozjs60 @60.8.0: fails due to no i386 atomics available when building with
clang-9.0
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  Reporter:  kencu              |      Owner:  macports-tickets@…
      Type:  defect             |     Status:  assigned
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:
Resolution:                     |   Keywords:
      Port:  mozjs60 clang-9.0  |
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Comment (by evanmiller):

 Any hints about the magic config arg? i386 was still failing as of Jan 15:

 https://build.macports.org/builders/ports-10.6_i386-builder/builds/53838

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Ticket URL: <https://trac.macports.org/ticket/63485#comment:4>
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