Revert

Author: gnodet

src/mdo/writer-stax.vm

@@ -528,7 +528,7 @@ public class ${className} {
         }
 
         private void indent() throws XMLStreamException {
-            super.writeCharacters(System.lineSeparator());
+            super.writeCharacters("\n");
             for (int i = 0; i < depth; i++) {
                 super.writeCharacters("  ");
             }