Added a small comment on the test ( it is one of the failings for embed )

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@273451 13f79535-47bb-0310-9956-ffa450edef68

src/testcases/org/apache/tools/ant/TopLevelTaskTest.java

@@ -54,6 +54,9 @@
 
 package org.apache.tools.ant;
 
+// This test will fail with embed, or if top-level is moved out of
+// dependency - as 'echo' happens as part of configureProject stage.
+
 /**
  * Tests for builds with tasks at the top level
  *