Symlink python.exe to python3.exe on Windows.
Apparently the Python installer doesn't do this by default (only the version installed from the Microsoft Store).
This ensures that `/usr/bin/env python3` works across all our platforms on Bazel CI.
@@ -141,6 +141,7 @@ $env:PATH = [Environment]::GetEnvironmentVariable("PATH", "Machine")
Write-Host "Installing Python 3..."
& choco install python3 --params "/InstallDir:C:\python3"
$env:PATH = [Environment]::GetEnvironmentVariable("PATH", "Machine")
+New-Item -ItemType SymbolicLink -Path "C:\python3\python3.exe" -Target "C:\python3\python.exe"
## Install a couple of Python modules required by TensorFlow.
Write-Host "Updating Python package management tools..."
