[tbb-bugs] #31845 [Applications/Tor Browser]: Bump GCC to 9.2

[Tor Bug Tracker & Wiki]

#31845: Bump GCC to 9.2
-------------------------------------+-------------------------------------
 Reporter:  cypherpunks              |          Owner:  tbb-team
     Type:  defect                   |         Status:  new
 Priority:  Medium                   |      Component:  Applications/Tor
                                     |  Browser
  Version:                           |       Severity:  Normal
 Keywords:  tbb-rbm, ff68-esr,       |  Actual Points:
  tbb-9.0-must-alpha,                |
  TorBrowserTeam201909,              |
  GeorgKoppen201909                  |
Parent ID:  #30320                   |         Points:
 Reviewer:                           |        Sponsor:
-------------------------------------+-------------------------------------
 GCC depends on MPC which depends on MPFR which depends on GMP.
 Please, update GCC with dependencies everywhere.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31845>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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