[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
--------------------------------+--------------------------------
  Reporter:  kencu              |      Owner:  macports-tickets@…
      Type:  defect             |     Status:  assigned
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:
Resolution:                     |   Keywords:
      Port:  mozjs60 clang-9.0  |
--------------------------------+--------------------------------

Comment (by kencu):

 I was combining this with other needed fixes, so as to not rebuild all the
 newer clangs just for this one little thing, so that’s why not all the
 clangs were done at once. (There are a few other triv fixes needed too in
 the libc++ config, and to fix the asm-redefinition issue that messes up
 legacy support on <10.6 with clang that I was combing into one commit.)


 I just can’t fix the formatting right on this ipad right now to give the
 pretty trac code version, so here’s the whole url.

 https://github.com/macports/macports-
 ports/commit/c53a09036eb6c71a52055965b4d300441f22da5a#diff-
 9c89fd7192470f28599999dc5c30c4d1fb98b49519a2b33d6e860ae43c281dcf

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Ticket URL: <https://trac.macports.org/ticket/63485#comment:5>
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