Change test case output to plain so works on JDK1.3

bug 38927, from Niall Pemberton

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/io/trunk@385284 13f79535-47bb-0310-9956-ffa450edef68

Author: Stephen Colebourne

build.xml

@@ -188,7 +188,7 @@
     </mkdir>
     <junit dir="${basedir}" failureproperty="test.failure" printSummary="yes" fork="true" haltonerror="true">
       <sysproperty key="basedir" value="." />
-      <formatter type="xml" />
+      <formatter type="plain" />
       <formatter usefile="false" type="plain" />
       <classpath>
         <path refid="build.classpath" />