[Bug 1856861] [NEW] Firefox 73 require C++17, not available in xenial

[Olivier Tilloy]

Public bug reported:

Firefox trunk, to become version 73.0 in February 2020, has bumped its
C++ requirement to C++17
(https://bugzilla.mozilla.org/show_bug.cgi?id=1560664).

This requires a more recent version (>= 7) of libstdc++6 than what is
currently available in xenial (5.4.0-6ubuntu1~16.04.12).

** Affects: firefox (Ubuntu)
     Importance: High
     Assignee: Olivier Tilloy (osomon)
         Status: Triaged

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Title:
  Firefox 73 require C++17, not available in xenial

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