Enabled plain formatter to get Checkstyle warnings from Gump builds

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1553214 13f79535-47bb-0310-9956-ffa450edef68

build.xml

@@ -1072,6 +1072,7 @@ NOTE:
       <fileset dir="${src.dir}" includes="**/*.java"/>
       <fileset dir="${test.dir}" includes="**/*.java"/>
       <formatter type="xml" toFile="${build.dir}/report_checkstyle.xml"/>
+      <formatter type="plain"/>
     </checkstyle>
   </target>
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