partimage: fix to build with zlib >= 1.2.5.2

original patch taken from gentoo linux

http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/sys-block/partimage/files/partimage-0.6.9-zlib-1.2.5.2.patch?revision=1.1

archiver/partimage/partimage-0.6.9-zlib-1.2.5.2.patch

@@ -0,0 +1,51 @@
+# --- SDE-COPYRIGHT-NOTE-BEGIN ---
+# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
+#
+# Filename: package/.../partimage/partimage-0.6.9-zlib-1.2.5.2.patch
+# Copyright (C) 2012 The OpenSDE Project
+#
+# More information can be found in the files COPYING and README.
+#
+# This patch file is dual-licensed. It is available under the license the
+# patched project is licensed under, as long as it is an OpenSource license
+# as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms
+# of the GNU General Public License as published by the Free Software
+# Foundation; either version 2 of the License, or (at your option) any later
+# version.
+# --- SDE-COPYRIGHT-NOTE-END ---
+
+Fix building with zlib >= 1.2.5.2
+
+http://bugs.gentoo.org/405323
+
+--- partimage-0.6.9-orig/src/client/imagefile.cpp
++++ partimage-0.6.9/src/client/imagefile.cpp
+@@ -783,7 +783,7 @@
+   else if (m_options.dwCompression == COMPRESS_GZIP) // Gzip compression
+     {
+       showDebug(1, "open gzip\n");
+-      m_gzImageFile = (gzFile *) gzdopen(m_nFdImage, "wb"); //"wb1h");
++      m_gzImageFile = gzdopen(m_nFdImage, "wb"); //"wb1h");
+       if (m_gzImageFile == NULL)
+ 	{
+ 	  showDebug(1, "error:%d %s\n", errno, strerror(errno));
+@@ -1098,7 +1098,7 @@
+     }
+   else if (m_options.dwCompression == COMPRESS_GZIP) // Gzip compression
+     {
+-      m_gzImageFile = (gzFile *) gzdopen(m_nFdImage, "rb");
++      m_gzImageFile = gzdopen(m_nFdImage, "rb");
+       if (m_gzImageFile == NULL)
+         THROW(ERR_ERRNO, errno);
+       else
+--- partimage-0.6.9-orig/src/client/imagefile.h
++++ partimage-0.6.9/src/client/imagefile.h
+@@ -41,7 +41,7 @@
+   COptions m_options;
+ 
+   FILE *m_fImageFile;
+-  gzFile *m_gzImageFile;
++  gzFile m_gzImageFile;
+   BZFILE *m_bzImageFile;
+ 
+   int m_nFdImage;