Rename build.ps1 to build-win64.ps1

Author: dilanbhalla

powershell/build.ps1 renamed to powershell/build-win64.ps1

@@ -15,4 +15,4 @@ Copy-Item -Path "$PSScriptRoot/downgrades" -Destination $powershellFolder -Recur
 $qlLibFolder = Join-Path -Path "$PSScriptRoot/ql" -ChildPath "lib"
 Copy-Item -Path (Join-Path $qlLibFolder "semmlecode.powershell.dbscheme") -Destination $powershellFolder -Force
 Copy-Item -Path (Join-Path $qlLibFolder "semmlecode.powershell.dbscheme.stats") -Destination $powershellFolder -Force
-Copy-Item -Path "$PSScriptRoot/tools" -Destination $powershellFolder -Recurse -Force
+Copy-Item -Path "$PSScriptRoot/tools" -Destination $powershellFolder -Recurse -Force