[tor-bugs] #20138 [Core Tor/Trunnel]: Add constified getters to trunnel

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#20138: Add constified getters to trunnel
------------------------------+------------------------------
 Reporter:  asn               |          Owner:  nickm
     Type:  task              |         Status:  needs_review
 Priority:  Medium            |      Milestone:
Component:  Core Tor/Trunnel  |        Version:
 Severity:  Normal            |     Resolution:
 Keywords:  trunnel           |  Actual Points:
Parent ID:                    |         Points:  .5
 Reviewer:                    |        Sponsor:
------------------------------+------------------------------

Comment (by nickm):

 > I almost feel like the const getter should be the default, and one
 should call a mutable function to get a non-const pointer. But this is
 probably too big of a change for now.

 Yeah; I don't really dig breaking backward compatibility. :)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20138#comment:5>
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