[tor-bugs] #31584 [Applications/Tor Browser]: Clean up mingw-w64 project

[Tor Bug Tracker & Wiki]

#31584: Clean up mingw-w64 project
-------------------------------------+-------------------------------------
     Reporter:  gk                   |      Owner:  tbb-team
         Type:  task                 |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-rbm, ff68-esr,
     Severity:  Normal               |  tbb-9.0-must-nightly,
                                     |  TorBrowserTeam201908,
                                     |  GeorgKoppen201908
Actual Points:                       |  Parent ID:  #30322
       Points:                       |   Reviewer:
      Sponsor:                       |
-------------------------------------+-------------------------------------
 We switched to `mingw-w64-clang` for the Firefox project and should not
 clean up the mingw-w64 as it still contains cruft related to our spec hack
 etc.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31584>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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