Update zlib to 1.2.5.

third_party/zlib/compress.c

Index: third_party/zlib/compress.c
===================================================================
--- third_party/zlib/compress.c	(revision 113739)
+++ third_party/zlib/compress.c	(working copy)
@@ -1,9 +1,9 @@
 /* compress.c -- compress a memory buffer
- * Copyright (C) 1995-2003 Jean-loup Gailly.
+ * Copyright (C) 1995-2005 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
-/* @(#) $Id: compress.c,v 3.6 2005/08/04 19:14:14 tor%cs.brown.edu Exp $ */
+/* @(#) $Id$ */
 
 #define ZLIB_INTERNAL
 #include "zlib.h"
@@ -75,5 +75,6 @@
 uLong ZEXPORT compressBound (sourceLen)
     uLong sourceLen;
 {
-    return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) + 11;
+    return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
+           (sourceLen >> 25) + 13;
 }