[tor-bugs] #28454 [Core Tor/Tor]: Actually use zstd on Appveyor

[Tor Bug Tracker & Wiki]

#28454: Actually use zstd on Appveyor
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     Reporter:  teor          |      Owner:  teor
         Type:  defect        |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.4.0.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: 0.3.4.1-alpha
     Severity:  Normal        |   Keywords:  tor-ci appveyor windows
Actual Points:                |  Parent ID:  #28399
       Points:                |   Reviewer:
      Sponsor:                |
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 We install zstd, but configure can't find it.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28454>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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