Fix Windows build

Appveyor adds ssl libs to the system folder which trips pythons ssl module

see https://github.com/appveyor/ci/issues/2571

appveyor.yml

@@ -18,6 +18,8 @@ clone_depth: 1
 #   - ps: iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
 
 build_script:
+  - del C:\Windows\System32\libssl-*.dll C:\Windows\system32\libcrypto-*.dll
+  - del C:\Windows\SysWOW64\libssl-*.dll C:\Windows\SysWOW64\libcrypto-*.dll
   - C:\msys64\usr\bin\pacman -Syuu --needed --noconfirm --noprogressbar --overwrite \\*
   - ps: |
         $env:TIME_STRING=(get-date -UFormat "%Y-%m-%d").ToString()