[tbb-bugs] #25710 [Applications/Tor Browser]: Extract from $rootdir in mingw-w64's setup.

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#25710: Extract from $rootdir in mingw-w64's setup.
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     Reporter:  dcf                       |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Minor                     |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 This makes it consistent with the setup of gcc and macosx-toolchain.

 I encountered this while trying to build go-webrtc with mingw-w64; the
 build script had already moved into a different directory when it tried to
 extract mingw-w64, and couldn't find the file.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25710>
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