Update Zlib to version 1.2.8

third_party/zlib/compress.c

 /* compress.c -- compress a memory buffer
  * Copyright (C) 1995-2005 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
 /* @(#) $Id$ */
 
 #define ZLIB_INTERNAL
 #include "zlib.h"
 
@@ skipping 11 matching lines @@
 int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
     Bytef *dest;
     uLongf *destLen;
     const Bytef *source;
     uLong sourceLen;
     int level;
 {
     z_stream stream;
     int err;
 
-    stream.next_in = (Bytef*)source;
+    stream.next_in = (z_const Bytef *)source;
     stream.avail_in = (uInt)sourceLen;
 #ifdef MAXSEG_64K
     /* Check for source > 64K on 16-bit machine: */
     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
 #endif
     stream.next_out = dest;
     stream.avail_out = (uInt)*destLen;
     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
 
     stream.zalloc = (alloc_func)0;
@@ skipping 28 matching lines @@
 /* ===========================================================================
      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) +
            (sourceLen >> 25) + 13;
 }