[nobug] remove offending attribute

Signed-off-by: Lukas Jungmann <lukas.jungmann@oracle.com>
diff --git a/utils/eclipselink.utils.sigcompare/antbuild.xml b/utils/eclipselink.utils.sigcompare/antbuild.xml
index 376bb8b..031a089 100644
--- a/utils/eclipselink.utils.sigcompare/antbuild.xml
+++ b/utils/eclipselink.utils.sigcompare/antbuild.xml
@@ -52,7 +52,7 @@
     <target name="clean" description="Clean the build">
         <delete includeEmptyDirs="true" failonerror="false">
             <fileset dir="${classes.dir}"/>
-            <fileset dir="." file="${sig-compare.jar}"/>
+            <fileset file="${sig-compare.jar}"/>
         </delete>
     </target>