Tests fail in Gump if BSF has been built without JavaScript support.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@693729 13f79535-47bb-0310-9956-ffa450edef68

src/tests/antunit/taskdefs/optional/script/scriptdef-test.xml

@@ -27,7 +27,10 @@
   
   <condition property="prereqs-ok">
     <or>
-      <available classname="org.apache.bsf.BSFManager"/>
+      <and>
+        <available classname="org.apache.bsf.BSFManager"/>
+        <available classname="org.apache.bsf.engines.javascript.JavaScriptEngine"/>
+      </and>
       <available classname="javax.script.ScriptEngineManager"/>
     </or>
   </condition>