tfs: fix global variable access

build/tfs/win32/1_build.ps1

@@ -13,7 +13,7 @@ $env:HOME=$env:USERPROFILE
 "machine monacotools.visualstudio.com password ${vsoPAT}" | Out-File "$env:USERPROFILE\_netrc" -Encoding ASCII
 
 step "Install dependencies" {
-  exec { & npm install "--arch=$arch" }
+  exec { & npm install "--arch=$global:arch" }
 }
 
 $env:VSCODE_MIXIN_PASSWORD = $mixinPassword
@@ -22,15 +22,15 @@ step "Mix in repository from vscode-distro" {
 }
 
 step "Get Electron" {
-  exec { & npm run gulp -- "electron-$arch" }
+  exec { & npm run gulp -- "electron-$global:arch" }
 }
 
 step "Install distro dependencies" {
-  exec { & node build\tfs\common\installDistro.js "--arch=$arch" }
+  exec { & node build\tfs\common\installDistro.js "--arch=$global:arch" }
 }
 
 step "Build minified" {
-  exec { & npm run gulp -- --max_old_space_size=4096 "vscode-win32-$arch-min" }
+  exec { & npm run gulp -- --max_old_space_size=4096 "vscode-win32-$global:arch-min" }
 }
 
 step "Run unit tests" {

build/tfs/win32/2_package.ps1

@@ -5,7 +5,7 @@ Param(
 . .\build\tfs\win32\lib.ps1
 
 step "Create archive and setup package" {
-	exec { & npm run gulp -- --max_old_space_size=4096 "vscode-win32-$arch-archive" "vscode-win32-$arch-setup" }
+	exec { & npm run gulp -- --max_old_space_size=4096 "vscode-win32-$global:arch-archive" "vscode-win32-$global:arch-setup" }
 }
 
 done
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build/tfs/win32/3_upload.ps1

@@ -22,11 +22,11 @@ $env:MOONCAKE_STORAGE_ACCESS_KEY = $mooncakeStorageKey
 $env:AZURE_DOCUMENTDB_MASTERKEY = $documentDbKey
 
 step "Publish archive" {
-  exec { & node build/tfs/common/publish.js $Quality win32-archive archive "VSCode-win32-$arch-$Version.zip" $Version true $Zip }
+  exec { & node build/tfs/common/publish.js $Quality win32-archive archive "VSCode-win32-$global:arch-$Version.zip" $Version true $Zip }
 }
 
 step "Publish setup package" {
-  exec { & node build/tfs/common/publish.js $Quality win32 setup "VSCodeSetup-$arch-$Version.exe" $Version true $Exe }
+  exec { & node build/tfs/common/publish.js $Quality win32 setup "VSCodeSetup-$global:arch-$Version.exe" $Version true $Exe }
 }
 
 done
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