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

[Tor Bug Tracker & Wiki]

#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 nickm):

 Good review, teor! It turns out that two of the functions were only used
 in feature/relay, which means they can just get a comment to that
 effect... but one of the functions was a candidate to become STATIC, and
 another was no longer used in Tor, and hadn't been used since 2009.

 I've pushed a few more commits; I'll merge this if/when CI passes.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33366#comment:5>
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