[tor-bugs] #29467 [Applications/Tor Browser]: Revert fix for #29182 and backport upstream arc4random_buf fix

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#29467: Revert fix for #29182 and backport upstream arc4random_buf fix
-------------------------------------------------+-------------------------
 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  closed
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:  fixed
 Keywords:  GeorgKoppen201902, TBA-a3,           |  Actual Points:
  TorBrowserTeam201903R, tbb-8.5                 |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by gk):

 * status:  merge_ready => closed
 * resolution:   => fixed


Comment:

 Thanks. Cherry-picked on top of `tor-browser-60.5.1esr-8.5-1` (commits
 9b575de574d95df16c34e64e38aa6d0b53b76837 and
 8de1662514e5191715055479b503dbb016899e84).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29467#comment:5>
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