[tor-bugs] #4991 [Tor Client]: Use standard windows-detection macros

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#4991: Use standard windows-detection macros
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 Reporter:  nickm                   |          Owner:                  
     Type:  defect                  |         Status:  needs_review    
 Priority:  normal                  |      Milestone:  Tor: unspecified
Component:  Tor Client              |        Version:                  
 Keywords:  easy, windows, cleanup  |         Parent:                  
   Points:                          |   Actualpoints:                  
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Comment(by Sebastian):

 I have two fixups and a new commit in my branch bug4991, please check it
 out

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4991#comment:6>
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