Merge pull request swiftlang#80752 from compnerd/staging

utils: correctly stage MSMs for Windows Runtime

Author: compnerd

utils/build.ps1

@@ -3169,7 +3169,9 @@ function Build-Installer([Hashtable] $Platform) {
 function Copy-BuildArtifactsToStage([Hashtable] $Platform) {
   Copy-File "$BinaryCache\$($Platform.Triple)\installer\Release\$($Platform.Architecture.VSName)\*.cab" $Stage
   Copy-File "$BinaryCache\$($Platform.Triple)\installer\Release\$($Platform.Architecture.VSName)\*.msi" $Stage
-  Copy-File "$BinaryCache\$($Platform.Triple)\installer\Release\$($Platform.Architecture.VSName)\*.msm" $Stage
+  foreach ($SDKPlatform in $WindowsSDKPlatforms) {
+    Copy-File "$BinaryCache\$($Platform.Triple)\installer\Release\$($SDKPlatform.Architecture.VSName)\*.msm" $Stage
+  }
   Copy-File "$BinaryCache\$($Platform.Triple)\installer\Release\$($Platform.Architecture.VSName)\installer.exe" $Stage
   # Extract installer engine to ease code-signing on swift.org CI
   if ($ToBatch) {