attempt to fix build after elemental change

Change-Id: I0d1595f9b0ffd80b0b160c9f2f83267ff5ffdbf8
diff --git a/elemental/build.xml b/elemental/build.xml
index 7333987..b69935b 100644
--- a/elemental/build.xml
+++ b/elemental/build.xml
@@ -33,14 +33,14 @@
   <target name="compile.tests" if="generated" depends="check.generated" description="Compile Tests">
     <echo message="${javac.junit.out}" />
     <mkdir dir="${javac.junit.out}" />
-    <javac srcdir="src:idl/generated/src:tests" destdir="${javac.junit.out}" excludes="**/super/**">
+    <gwt.javac srcdir="src:idl/generated/src:tests" destdir="${javac.junit.out}" excludes="**/super/**">
       <classpath>
         <pathelement location="${javac.out}"/>
         <pathelement location="${gwt.dev.jar}" />
         <pathelement location="${gwt.user.jar}" />
         <pathelement location="${gwt.tools.lib}/junit/junit-4.8.2.jar" />
       </classpath>
-    </javac>
+    </gwt.javac>
   </target>
 
   <target name="build" depends="generate, compile"