[tor-bugs] #33564 [Applications/Tor Browser]: Upgrade ZSTD to use Android NDK 21

[Tor Bug Tracker & Wiki]

#33564: Upgrade ZSTD to use Android NDK 21
-------------------------------------------------+-------------------------
 Reporter:  sisbell                              |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-mobile, tbb-rbm,                 |  Actual Points:  .1
  TorBrowserTeam202005R                          |
Parent ID:  #33184                               |         Points:
 Reviewer:  gk                                   |        Sponsor:
                                                 |  Sponsor58-must
-------------------------------------------------+-------------------------

Comment (by gk):

 Looks good to me and works. I've pushed `bug_33564`
 (https://gitweb.torproject.org/user/gk/tor-browser-
 build.git/commit/?h=bug_33564&id=a772e81b5104e5aa179b62ffceaff3f60ae127b2)
 with a slightly modified commit message and on top of my `fenix_toolchain`
 branch.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33564#comment:7>
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