simplify build parameters

docs/org.eclipse.wst.doc.isv/javadoc.xml

@@ -22,16 +22,6 @@
     <property
       file="${env.LOCAL_BUILD_PROPERTIES_DIR}/${ant.project.name}.properties" />
 	
-
-	  <!-- if not otherwise set externally, assign some reasonable default, especially 
-	  to work on production build machine -->
-    <property
-        name="JAVADOC_COMMAND"
-        value="${env.JAVA_5_HOME}/bin/javadoc" />
-    <property
-      name="JAVADOC_ARGS"
-      value="-J-Xms256m -J-Xmx1024m" />
-	
 	
     <property file="javadoc.properties" />
     <property