fixed build clean

build.xml

@@ -401,7 +401,7 @@
   <target name="clean" description="make clean">
     <delete dir="${release_main}" failonerror="false"/>
     <delete failonerror="false">
-      <fileset dir="${lib}" includes="**/*.jar" exclude="org.restlet.jar" /> <!-- we cannot find the org.restlet.jar in maven -->
+      <fileset dir="${lib}" includes="**/*.jar" excludes="org.restlet.jar" /> <!-- we cannot find the org.restlet.jar in maven -->
       <fileset dir="${src}" includes="**/*.class" />
       <fileset dir="${build}" includes="**/*.class" />
       <fileset dir="test/" includes="**/*.class" />