Fix [serial] compiler warnings

Fix serialization warnings by applying @SuppressWarnings("serial")
when appropriate.

In certain cases and for unknown reasons, a correctly-placed
@SuppressWarnings("serial") annotation will fix the warning at the
javac level (i.e. the Gradle command-line), but will produce an
"unnecessary @SuppressWarnings" warning within Eclipse. In these
cases, a private static final serialVersionUID field has been added
with the default value of 1L.

spring-struts/src/main/java/org/springframework/web/struts/SpringBindingActionForm.java

@@ -88,6 +88,7 @@ import org.springframework.validation.ObjectError;
  * @deprecated as of Spring 3.0
  */
 @Deprecated
+@SuppressWarnings("serial")
 public class SpringBindingActionForm extends ActionForm {
 
 	private static final Log logger = LogFactory.getLog(SpringBindingActionForm.class);