Remove unused import.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@276429 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/Exit.java

@@ -17,7 +17,6 @@
 
 package org.apache.tools.ant.taskdefs;
 
-import java.util.Vector;
 import org.apache.tools.ant.Task;
 import org.apache.tools.ant.BuildException;
 import org.apache.tools.ant.taskdefs.condition.Condition;