bpo-34144: Fix of venv acvtivate.bat for win 10 (GH-8321)

The script needs to be updated to support win 10/ 1803 chcp.com command (output has trailing dot)





https://bugs.python.org/issue34144

Lib/venv/scripts/nt/activate.bat

 @echo off
 
 rem This file is UTF-8 encoded, so we need to update the current code page while executing it
-for /f "tokens=2 delims=:" %%a in ('"%SystemRoot%\System32\chcp.com"') do (
+for /f "tokens=2 delims=:." %%a in ('"%SystemRoot%\System32\chcp.com"') do (
     set "_OLD_CODEPAGE=%%a"
 )
 if defined _OLD_CODEPAGE (

Misc/NEWS.d/next/Windows/2019-04-10-04-35-31.bpo-34144._KzB5z.rst

+Fixed activate.bat to correctly update codepage when chcp.com returns dots in output.
+Patch by Lorenz Mende.