[tor-bugs] #34320 [Applications/Tor Browser]: fetch-gradle-dependencies should respect tmp_dir

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#34320: fetch-gradle-dependencies should respect tmp_dir
-------------------------------------+-------------------------------------
     Reporter:  gk                   |      Owner:  gk
         Type:  defect               |     Status:  assigned
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-rbm,
     Severity:  Normal               |  GeorgKoppen202005,
                                     |  TorBrowserTeam202005
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
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 `tmp_dir` is set to `[% c("basedir") %]/tmp` in `rbm.conf` and can get
 overriden in a local rbm config file. Sometimes /tmp is too small for
 building projects which motivated both the current default as the option
 to override it.

 However, `fetch-gradle-dependencies` does not respect that by simply doing
 `m2dir="$(mktemp -d)"`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34320>
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