[tor-bugs] #20660 [Applications/Tor Browser]: The update_responses script should use mar-tools from the release`s directory

[Tor Bug Tracker & Wiki]

#20660: The update_responses script should use mar-tools from the release`s
directory
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     Reporter:  boklm                     |      Owner:  boklm
         Type:  task                      |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
                                          |  TorBrowserTeam201611
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 The current version of the `update_responses` script is using the mar-
 tools from the path `../../../gitian-builder/inputs/mar-tools-
 linux64.zip`.

 This works fine when a build with the correct version has been done before
 from this directory, but this is not always the case.

 Instead, it should be using the `mar-tools-linux64.zip` from the release`s
 directory.

 This should also help for #17381.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20660>
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