[tor-bugs] #26024 [Core Tor/Tor]: cargo vendor rand-0.5.0-pre.1 dependency

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#26024: cargo vendor rand-0.5.0-pre.1 dependency
------------------------------+--------------------------------
     Reporter:  isis          |      Owner:  isis
         Type:  defect        |     Status:  assigned
     Priority:  Immediate     |  Milestone:  Tor: 0.3.4.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:  1             |   Reviewer:
      Sponsor:  Sponsor3-can  |
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 I think we can also remove the `src/ext/rust/vendor/rand-8c5b0ac51d`
 manually vendored dependency (and if not, we can at least definitely
 remove `src/ext/rust/vendor/rand-8c5b0ac51d/master.zip`).

 This is currently [https://travis-ci.org/torproject/tor/jobs/374671123
 breaking Travis builds], and doing this [https://travis-
 ci.org/isislovecruft/tor/builds/375039767 fixes the builds].

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26024>
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