Include compatibility web.xml in uitest.war (#11688)

Change-Id: I4f500e37ef7b96e103d66c40fba152299516a55f

uitest/build.xml

@@ -121,6 +121,7 @@
                 <include name="VAADIN/themes/tests-*/**" />
                 <include name="VAADIN/themes/reindeer-tests/**" />
                 <include name="WEB-INF/*.xml" />
+                <include name="WEB-INF/web.xml.2.4" />
             </fileset>
             <classes dir="${classes}" />
             <classes dir="${src}" />
@@ -146,4 +147,4 @@
         <echo>WHAT? No JUnit tests for ${module.name}!</echo>
     </target>
 
-</project>
+</project>