Fix Heat Harvesting for x64 Dlls

Fixes: wixtoolset/issues#8803

src/tools/heat/UtilFinalizeHarvesterMutator.cs

@@ -856,7 +856,7 @@ private void MutateComponents()
                                         processed = true;
                                     }
                                 }
-                                else if (5 == parts.Length && String.Equals("win32", parts[4], StringComparison.OrdinalIgnoreCase))
+                                else if (5 == parts.Length && (String.Equals("win32", parts[4], StringComparison.OrdinalIgnoreCase) || String.Equals("win64", parts[4], StringComparison.OrdinalIgnoreCase)))
                                 {
                                     typeLib.Language = Convert.ToInt32(parts[3], CultureInfo.InvariantCulture);