[tor-bugs] #21092 [Applications/Tor Browser]: Include `libnotify-dev` in the `sandboxed-tor-browser` descriptor.

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#21092: Include `libnotify-dev` in the `sandboxed-tor-browser` descriptor.
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     Reporter:  yawning                   |      Owner:  tbb-team
         Type:  task                      |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 As of master due to how I implemented #20778, `sandboxed-tor-browser` now
 requires `libnotify-dev` when building.

 In theory all I need is the header files, but `libnotify` may also be
 required as well.  The version shipped with jessie should be fine.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21092>
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