[tor-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:  new
 Priority:  Very High                            |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-rbm, ff60-esr,                   |  Actual Points:
  TorBrowserTeam201805, GeorgKoppen201805        |
Parent ID:  #24632                               |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by gk):

 We are still getting an error:
 {{{
 bufferevent_openssl.c:66:10: fatal error: 'openssl/bio.h' file not found
 #include <openssl/bio.h>
          ^
 1 error generated.
 }}}
 That is fixed in a revision which is not included in any stable release
 yet. Nevertheless, it's easier to backport the fix to 2.1.8, so we are
 switching to that stable version while we are at it. With that compilation
 is still working on all supported platform/architecture combinations and
 the result is at least running on my Linux x86_64 box. So, I am slightly
 optimistic that we are good with the fix.

 The patch is pretty self-contained and forthcoming...

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26249#comment:3>
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