[tor-bugs] #28973 [Core Tor/Tor]: Disable TLS1.3 when openssl bug 7712 is present

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#28973: Disable TLS1.3 when openssl bug 7712 is present
-------------------------------------------------+-------------------------
 Reporter:  nickm                                |          Owner:  nickm
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  High                                 |      Milestone:  Tor:
                                                 |  0.4.0.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.3.4.9
 Severity:  Normal                               |     Resolution:
 Keywords:  033-backport 034-backport            |  Actual Points:
  035-backport                                   |
Parent ID:  #28616                               |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by nickm):

 I've tested this with chutney, openssl 1.1.1a, and git master, confirming
 that with this patch, chutney succeeds with openssl 1.1.1a, but fails
 without it.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28973#comment:3>
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