update windows build to Python 3.7

Lib/venv/scripts/nt/Activate.ps1

@@ -0,0 +1,51 @@
+function global:deactivate ([switch]$NonDestructive) {
+    # Revert to original values
+    if (Test-Path function:_OLD_VIRTUAL_PROMPT) {
+        copy-item function:_OLD_VIRTUAL_PROMPT function:prompt
+        remove-item function:_OLD_VIRTUAL_PROMPT
+    }
+
+    if (Test-Path env:_OLD_VIRTUAL_PYTHONHOME) {
+        copy-item env:_OLD_VIRTUAL_PYTHONHOME env:PYTHONHOME
+        remove-item env:_OLD_VIRTUAL_PYTHONHOME
+    }
+
+    if (Test-Path env:_OLD_VIRTUAL_PATH) {
+        copy-item env:_OLD_VIRTUAL_PATH env:PATH
+        remove-item env:_OLD_VIRTUAL_PATH
+    }
+
+    if (Test-Path env:VIRTUAL_ENV) {
+        remove-item env:VIRTUAL_ENV
+    }
+
+    if (!$NonDestructive) {
+        # Self destruct!
+        remove-item function:deactivate
+    }
+}
+
+deactivate -nondestructive
+
+$env:VIRTUAL_ENV="__VENV_DIR__"
+
+if (! $env:VIRTUAL_ENV_DISABLE_PROMPT) {
+    # Set the prompt to include the env name
+    # Make sure _OLD_VIRTUAL_PROMPT is global
+    function global:_OLD_VIRTUAL_PROMPT {""}
+    copy-item function:prompt function:_OLD_VIRTUAL_PROMPT
+    function global:prompt {
+        Write-Host -NoNewline -ForegroundColor Green '__VENV_PROMPT__'
+        _OLD_VIRTUAL_PROMPT
+    }
+}
+
+# Clear PYTHONHOME
+if (Test-Path env:PYTHONHOME) {
+    copy-item env:PYTHONHOME env:_OLD_VIRTUAL_PYTHONHOME
+    remove-item env:PYTHONHOME
+}
+
+# Add the venv to the PATH
+copy-item env:PATH env:_OLD_VIRTUAL_PATH
+$env:PATH = "$env:VIRTUAL_ENV\__VENV_BIN_NAME__;$env:PATH"

Lib/venv/scripts/nt/activate.bat

@@ -0,0 +1,45 @@
+@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 (
+    set "_OLD_CODEPAGE=%%a"
+)
+if defined _OLD_CODEPAGE (
+    "%SystemRoot%\System32\chcp.com" 65001 > nul
+)
+
+set "VIRTUAL_ENV=__VENV_DIR__"
+
+if not defined PROMPT (
+    set "PROMPT=$P$G"
+)
+
+if defined _OLD_VIRTUAL_PROMPT (
+    set "PROMPT=%_OLD_VIRTUAL_PROMPT%"
+)
+
+if defined _OLD_VIRTUAL_PYTHONHOME (
+    set "PYTHONHOME=%_OLD_VIRTUAL_PYTHONHOME%"
+)
+
+set "_OLD_VIRTUAL_PROMPT=%PROMPT%"
+set "PROMPT=__VENV_PROMPT__%PROMPT%"
+
+if defined PYTHONHOME (
+    set "_OLD_VIRTUAL_PYTHONHOME=%PYTHONHOME%"
+    set PYTHONHOME=
+)
+
+if defined _OLD_VIRTUAL_PATH (
+    set "PATH=%_OLD_VIRTUAL_PATH%"
+) else (
+    set "_OLD_VIRTUAL_PATH=%PATH%"
+)
+
+set "PATH=%VIRTUAL_ENV%\__VENV_BIN_NAME__;%PATH%"
+
+:END
+if defined _OLD_CODEPAGE (
+    "%SystemRoot%\System32\chcp.com" %_OLD_CODEPAGE% > nul
+    set "_OLD_CODEPAGE="
+)

Lib/venv/scripts/nt/deactivate.bat

@@ -0,0 +1,21 @@
+@echo off
+
+if defined _OLD_VIRTUAL_PROMPT (
+    set "PROMPT=%_OLD_VIRTUAL_PROMPT%"
+)
+set _OLD_VIRTUAL_PROMPT=
+
+if defined _OLD_VIRTUAL_PYTHONHOME (
+    set "PYTHONHOME=%_OLD_VIRTUAL_PYTHONHOME%"
+    set _OLD_VIRTUAL_PYTHONHOME=
+)
+
+if defined _OLD_VIRTUAL_PATH (
+    set "PATH=%_OLD_VIRTUAL_PATH%"
+)
+
+set _OLD_VIRTUAL_PATH=
+
+set VIRTUAL_ENV=
+
+:END