[tor-bugs] #31646 [Applications/Tor Browser]: Update abicheck to require newer libstdc++.so.6

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#31646: Update abicheck to require newer libstdc++.so.6
-------------------------------------+-------------------------------------
     Reporter:  boklm                |      Owner:  tbb-team
         Type:  defect               |     Status:  new
     Priority:  Very High            |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-rbm,
     Severity:  Normal               |  TorBrowserTeam201909, tbb-9.0-must-
                                     |  alpha, ff68-esr
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
-------------------------------------+-------------------------------------
 We should update `projects/firefox/abicheck.cc` to use features only
 provided by more recent versions of `libstdc++.so.6`.

 Currently it only requires `GLIBCXX_3.4.22`:
 {{{
 $ strings tor-browser_en-US/Browser/abicheck | grep GLIBCXX_
 GLIBCXX_3.4
 GLIBCXX_3.4.22
 GLIBCXX_3.4.21
 }}}

 https://gcc.gnu.org/onlinedocs/libstdc++/manual/abi.html

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31646>
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