Update zlib to 1.2.5.

third_party/zlib/compress.c

 /* 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"
 
 /* ===========================================================================
      Compresses the source buffer into the destination buffer. The level
    parameter has the same meaning as in deflateInit.  sourceLen is the byte
    length of the source buffer. Upon entry, destLen is the total size of the
    destination buffer, which must be at least 0.1% larger than sourceLen plus
    12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
@@ skipping 51 matching lines @@
     return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
 }
 
 /* ===========================================================================
      If the default memLevel or windowBits for deflateInit() is changed, then
    this function needs to be updated.
  */
 uLong ZEXPORT compressBound (sourceLen)
     uLong sourceLen;
 {
-    return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) + 11;
+    return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
+           (sourceLen >> 25) + 13;
 }