[tor-bugs] #19554 [Core Tor/Tor]: Require libevent >= 2

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#19554: Require libevent >= 2
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 Reporter:  Sebastian     |          Owner:
     Type:  defect        |         Status:  needs_review
 Priority:  Medium        |      Milestone:  Tor: 0.3.0.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:                |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
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Comment (by cypherpunks):

 Some more suggestions.

 src/common/compat_libevent.h
 - Include the Libevent headers `event2/event.h` and `event2/bufferevent.h`
 instead of declaring the Libevent structs.
 - Remove the `event2/util.h` include because it's already included by
 `event2/event.h`.
 - Remove the function aliases and replace instances in the rest of the
 code.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19554#comment:4>
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