Switch on the 'build' antlib.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@272065 13f79535-47bb-0310-9956-ffa450edef68

proposal/myrmidon/build.xml

@@ -523,6 +523,10 @@ Legal:
         <ant antfile="antlib.xml">
             <property name="antlib.name" value="java"/>
         </ant>
+
+        <ant antfile="antlib.xml">
+            <property name="antlib.name" value="build"/>
+        </ant>
     </target>
 
     <!-- Compiles and runs the unit tests -->