[tor-bugs] #31173 [Applications/Tor Browser]: Update android-toolchain project to match firefox

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#31173: Update android-toolchain project to match firefox
-------------------------------------------------+-------------------------
 Reporter:  sisbell                              |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-rbm, ff68-esr,                   |  Actual Points:
  TorBrowserTeam201907R, tbb-9.0-must-nightly    |
Parent ID:  #30324                               |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by sisbell):

 Replying to [comment:5 cypherpunks]:
 > r17b! Not even r17c! It is a minimum supported version! Not something
 you should use.
 > Recommended version is **r20**. We need at least `-fstack-protector-
 strong` from r18b, see https://github.com/android-
 ndk/ndk/wiki/Changelog-r18

 The approach is follow the firefox toolchain and versions as precisely as
 possible so as to not introduce unexpected build results or runtime
 behavior. This means there will be some lag in version updates for the
 tools.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31173#comment:7>
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