[tor-bugs] #33760 [Applications/Tor Browser]: Update rbm.conf to match NDK 20

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#33760: Update rbm.conf to match NDK 20
-------------------------------------------------+-------------------------
 Reporter:  sisbell                              |          Owner:  gk
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-mobile, tbb-rbm,                 |  Actual Points:
  TorBrowserTeam202005R, GeorgKoppen202005       |
Parent ID:  #33184                               |         Points:
 Reviewer:  sysrqb                               |        Sponsor:
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Comment (by gk):

 We need an additional fixup to get `libevent` and friends properly
 compiled: We have `configure_opt` pointing to `clang` directly, currently:
 `CC=clang --host=[% c("var/configure_host") %] [%
 c("var/configure_opt_project") %]`. That's been cool with the previous NDK
 as there `clang` has just been a wrapper containing the proper target
 argument. But that's not the case anymore with NDK 20.

 `fenix_toolchain4` (https://gitweb.torproject.org/user/gk/tor-browser-
 build.git/commit/?h=fenix_toolchain4&id=60ce3f8f0bceb0608655c8190554a1435e72a725)
 takes that into account now.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33760#comment:12>
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