[issue30450] Pull Windows dependencies from GitHub rather than svn.python.org

[Antoine Pitrou]

Antoine Pitrou added the comment:

I just got a download failure on an AppVeyor build:
https://ci.appveyor.com/project/python/cpython/build/3.7.0a0.4571

Downloading nuget...
Invoke-WebRequest : The operation has timed out.
At line:1 char:1
+ Invoke-WebRequest https://aka.ms/nugetclidl -OutFile 'C:\projects\cpy ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:Htt 
   pWebRequest) [Invoke-WebRequest], WebException
    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShe 
   ll.Commands.InvokeWebRequestCommand
 
  File "<string>", line 1
    C:\projects\cpython\PCbuild\\urlretrieve.py
     ^
SyntaxError: invalid syntax
Installing Python via nuget...

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<http://bugs.python.org/issue30450>
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