Update zlib to 1.2.5.

third_party/zlib/contrib/minizip/iowin32.h

Index: third_party/zlib/contrib/minizip/iowin32.h
===================================================================
--- third_party/zlib/contrib/minizip/iowin32.h	(revision 113739)
+++ third_party/zlib/contrib/minizip/iowin32.h	(working copy)
@@ -1,10 +1,14 @@
 /* iowin32.h -- IO base function header for compress/uncompress .zip
-   files using zlib + zip or unzip API
-   This IO API version uses the Win32 API (for Microsoft Windows)
+     Version 1.1, February 14h, 2010
+     part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
 
-   Version 1.01e, February 12th, 2005
+         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
 
-   Copyright (C) 1998-2005 Gilles Vollant
+         Modifications for Zip64 support
+         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
+
+         For more info read MiniZip_info.txt
+
 */
 
 #include <windows.h>
@@ -15,6 +19,9 @@
 #endif
 
 void fill_win32_filefunc OF((zlib_filefunc_def* pzlib_filefunc_def));
+void fill_win32_filefunc64 OF((zlib_filefunc64_def* pzlib_filefunc_def));
+void fill_win32_filefunc64A OF((zlib_filefunc64_def* pzlib_filefunc_def));
+void fill_win32_filefunc64W OF((zlib_filefunc64_def* pzlib_filefunc_def));
 
 #ifdef __cplusplus
 }