finalize deflater instance in ZipOutputStream.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@1153485 13f79535-47bb-0310-9956-ffa450edef68

WHATSNEW

@@ -57,6 +57,7 @@ Fixed bugs:
 
  * ZipFile failed to clean up some resources which could lead to
    OutOfMemoryException while unzipping large archives.
+   A similar problem in ZipArchiveOutputStream has been fixed as well.
    Bugzilla Report 42969.
 
  * quiet attribute added to the copy and move tasks, to be used together

src/main/org/apache/tools/zip/ZipOutputStream.java

@@ -409,6 +409,7 @@ public class ZipOutputStream extends FilterOutputStream {
         writeCentralDirectoryEnd();
         offsets.clear();
         entries.clear();
+        def.end();
     }
 
     /**