[tor-bugs] #15248 [Tor]: autoconf: drop workarounds for libevent <1.3

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#15248: autoconf: drop workarounds for libevent <1.3
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 Reporter:  nickm              |          Owner:
     Type:  defect             |         Status:  new
 Priority:  minor              |      Milestone:  Tor: 0.2.7.x-final
Component:  Tor                |        Version:
 Keywords:  autoconf libevent  |  Actual Points:
Parent ID:                     |         Points:
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 All of our checks for u_int_* in configure.ac are unneeded, since Libevent
 stopped littering its headers with those in 1.3.

 Similarly, there are functions that we're checking for which libevent
 probably has unconditionally in all the versions we support.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15248>
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