[tbb-bugs] #26249 [Applications/Tor Browser]: Update libevent to prevent broken compilation when targetting macOS 10.7

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#26249: Update libevent to prevent broken compilation when targetting macOS 10.7
-------------------------------------------------+-------------------------
 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  Very High                            |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-rbm, ff60-esr,                   |  Actual Points:
  TorBrowserTeam201805R, GeorgKoppen201805       |
Parent ID:  #24632                               |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by gk):

 * keywords:  tbb-rbm, ff60-esr, TorBrowserTeam201805, GeorgKoppen201805 =>
     tbb-rbm, ff60-esr, TorBrowserTeam201805R, GeorgKoppen201805
 * status:  new => needs_review


Comment:

 `bug_26249` (https://gitweb.torproject.org/user/gk/tor-browser-
 build.git/commit/?h=bug_26249&id=ef90f3c7881467df0500674dae84d44e247d459c)
 in my public `tor-browser-build` repo has a potential fix. I singled that
 one out as it affects our Linux builds, too, and the change could get more
 coverage in our nightlies if it would get merged earlier.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26249#comment:4>
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