use FileUtils.close

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@377305 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/optional/ANTLR.java

@@ -407,11 +407,7 @@ public class ANTLR extends Task {
         } catch (IOException e) {
             throw new BuildException(e, getLocation());
         } finally {
-            try {
-                bos.close();
-            } catch (IOException e) {
-                // ignore
-            }
+            FileUtils.close(bos);
         }
     }