[MacPorts] #72055: openssl3 @3.4.1: build fails on older OS versions: redefinition of 'fallback_atomic_exchange_n_uint64_t'

[MacPorts]

#72055: openssl3 @3.4.1: build fails on older OS versions: redefinition of
'fallback_atomic_exchange_n_uint64_t'
---------------------------------------------+--------------------
  Reporter:  aeiouaeiouaeiouaeiouaeiouaeiou  |      Owner:  (none)
      Type:  defect                          |     Status:  new
  Priority:  Normal                          |  Milestone:
 Component:  ports                           |    Version:
Resolution:                                  |   Keywords:
      Port:  openssl3                        |
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Comment (by jmroot):

 If someone wants to make a PR, it should probably be based on these two
 commits with all the fixups from the upstream PR squashed:
  *
 https://github.com/openssl/openssl/commit/80040de93593a8b3ca34c009931bf95b13dd2c4b
  *
 https://github.com/openssl/openssl/commit/51f69325e868d7fe39a23077feddd87217821d65

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Ticket URL: <https://trac.macports.org/ticket/72055#comment:8>
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