[tbb-bugs] #30376 [Applications/Tor Browser]: Use Rust 1.34 for Tor Browser 9

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#30376: Use Rust 1.34 for Tor Browser 9
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     Reporter:  gk                        |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-rbm, ff68-esr
Actual Points:                            |  Parent ID:  #30320
       Points:                            |   Reviewer:
      Sponsor:                            |
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 https://bugzilla.mozilla.org/show_bug.cgi?id=1536543 set the Rust
 requirement to 1.34 and we should follow that if there are no strong
 reasons against that. While adapting our Rust part we should/could
 consider the following tasks:

 1) We don't need to build a newer Rust anymore just for the tor nightlies
 2) Given our work on the mingw-w64/clang toolchain for #28328, which
 requites a pretty new toolchain, we could test using the llvm we already
 build for that one to copmile Rust instead of building an own llvm during
 Rust build
 3) We need to switch the target for armv7 to `thumbv7neon-linux-
 androidabi` (see: https://bugzilla.mozilla.org/show_bug.cgi?id=1521734 for
 more details).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30376>
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