test current NumPy master for Python 3.9 fixes on Windows.

Author: charris

azure/windows.yml

@@ -26,10 +26,6 @@ jobs:
         displayName: Set python version
         condition: not(contains(variables['PYTHON_VERSION'], 'PyPy'))
 
-      - powershell: |
-          Set-ItemProperty 'HKLM:\System\CurrentControlSet\Control\FileSystem' -Name 'LongPathsEnabled' -value 1
-        displayName: "Enable long path names"
-
       - powershell: |
           $url = "http://buildbot.pypy.org/nightly/py3.6/pypy-c-jit-latest-win32.zip"
           $output = "pypy.zip"