[tor-bugs] #20267 [Core Tor/Tor]: Use -DOPENSSL_SYS_WIN32 on Windows

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#20267: Use -DOPENSSL_SYS_WIN32 on Windows
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     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.9.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  regression, windows
Actual Points:                |  Parent ID:
       Points:  0.1           |   Reviewer:
      Sponsor:                |
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 Tor fails to compile on Windows MinGW/msys with an error about X509_NAME
 being an integer literal.

 This is because OPENSSL_SYS_WIN32 is not defined, but it should be.

 When we are on Win32, we should define this preprocessor directive.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20267>
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