[tor-bugs] #9108 [Tor]: Make circuitbuild.c: global_circuitlist a proper doubly-linked list

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#9108: Make circuitbuild.c: global_circuitlist a proper doubly-linked list
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 Reporter:  marek        |          Owner:                  
     Type:  enhancement  |         Status:  new             
 Priority:  minor        |      Milestone:  Tor: unspecified
Component:  Tor          |        Version:                  
 Keywords:               |         Parent:                  
   Points:               |   Actualpoints:                  
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 I had a go at #4519, and instead of doing the thing described there I
 decided to simplify the code and make the big `global_circuitlist` list a
 nice doubly-linked list.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/9108>
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