[tor-bugs] #33366 [Core Tor/Tor]: Disable dns.c when relay mode is disabled

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#33366: Disable dns.c when relay mode is disabled
-------------------------------------------------+-------------------------
 Reporter:  nickm                                |          Owner:  nickm
     Type:  defect                               |         Status:
                                                 |  needs_revision
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.4.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-design, network-team-roadmap-    |  Actual Points:  .2
  2020Q1, 043-deferred library-size              |
Parent ID:  #31851                               |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by teor):

 I opened #33375 for exits to stop using an IPv6 exit policy when
 `dns_seems_to_be_broken_for_ipv6()`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33366#comment:4>
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