[MacPorts] #70348: ruby33 @3.3.4: error: use of undeclared identifier 'memory_order_seq_cst' on macOS 10.7-10.9

[MacPorts]

#70348: ruby33 @3.3.4: error: use of undeclared identifier 'memory_order_seq_cst'
on macOS 10.7-10.9
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  Reporter:                          |      Owner:  kimuraw
  aeiouaeiouaeiouaeiouaeiouaeiou     |
      Type:  defect                  |     Status:  assigned
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:
Resolution:                          |   Keywords:  lion, mountainlion,
      Port:  ruby33                  |  mavericks
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Comment (by aeiouaeiouaeiouaeiouaeiouaeiou):

 Replying to [comment:1 jmroot]:
 > It's also adding an explicit `-std=c99` for older platforms, which seems
 like it would be a problem

 https://github.com/macports/macports-ports/pull/24869

 Note that Xcode Clang 9 is already blacklisted due to a compilation bug,
 so it may even be easier to mark removing everything below the number 901.

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Ticket URL: <https://trac.macports.org/ticket/70348#comment:2>
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