[tor-bugs] #24632 [Applications/Tor Browser]: Update macOS toolchain for ESR 60

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#24632: Update macOS toolchain for ESR 60
-------------------------------------------------+-------------------------
 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  Very High                            |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-rbm, ff60-esr,                   |  Actual Points:
  TorBrowserTeam201806R, GeorgKoppen201805       |
Parent ID:  #24631                               |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by boklm):

 I cherry-picked the following commits on master:
 - `7997d2322347f742e7f4ede47379119faeb03bdd`: `Bug 24632: Use our new
 toolchain for rustc compilation`
 - `3b5038d90cac5cfcf6856cc0786cfa99adbc775a`: `Bug 24632: Adapt tor and
 OpenSSL for new macOS toolchain`
 - `a0130c9a178ae919a400ad014d7f855a282c72b4`: `Bug 24632: Bump clang
 version in go build script comment`
 - `3db16b9c473ec950452126700fc1e22f71ed8190`: `Bug 24632: Disable
 snowflake for macOS for now`

 The last missing one is `Bug 24632: Adapt firefox and tor-browser to new
 macOS toolchain`. For this one, I think we don't need to include `llvm` in
 the firefox build for macOS, as it is already included in `macosx-
 toolchain`. So I suggest the following change (fixup commit to be squased
 after review):
 https://gitweb.torproject.org/user/boklm/tor-browser-
 build.git/commit/?h=bug_26003_v2&id=6f7ae06bbae28efc8a84db504c1ceb1744bb8a88

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24632#comment:18>
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