Fixing the headerFile location as per CODEC-67 and Benjamin's patch

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/codec/trunk@651969 13f79535-47bb-0310-9956-ffa450edef68

Author: hen

checkstyle.xml

@@ -27,7 +27,7 @@ limitations under the License.
   <module name="TreeWalker">
     <!-- Verify that EVERY source file has the appropriate license -->
     <module name="Header">
-      <property name="headerFile" value="LICENSE-header.txt"/>
+      <property name="headerFile" value="${basedir}/LICENSE-header.txt"/>
     </module>
 
     <module name="OperatorWrap">