get rid of Ant 1.8.0 warnings

git-svn-id: https://svn.apache.org/repos/asf/ant/antlibs/common/trunk@799515 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/build.xml b/build.xml
index 5945eb1..d3fd485 100644
--- a/build.xml
+++ b/build.xml
@@ -88,6 +88,7 @@
       debug="${javac.debug}"
       source="${javac.-source}"
       target="${javac.-target}"
+      includeantruntime="false"
       />
   </target>