[tor-bugs] #31630 [Core Tor/Tor]: Remove unused assign/encode functions in structvar.

[Tor Bug Tracker & Wiki]

#31630: Remove unused assign/encode functions in structvar.
-------------------------------+--------------------------------
     Reporter:  nickm          |      Owner:  nickm
         Type:  defect         |     Status:  assigned
     Priority:  Medium         |  Milestone:  Tor: 0.4.2.x-final
    Component:  Core Tor/Tor   |    Version:
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:  #29211
       Points:  0              |   Reviewer:
      Sponsor:  Sponsor31-can  |
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 The "assign" and "encode" functions in structvar are never used, since
 they operate on strings, and all of our config code uses config_line_t.
 We can safely remove them.

 We can only do this once #31629 is merged, or else we will get conflicts.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31630>
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