zlib: changed to build at stage 0

Actually it is better to rely on our own zlib instead of relying on a version
from the host.

archiver/zlib/zlib.desc

@@ -3,7 +3,7 @@
 [COPY] This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 [COPY]
 [COPY] Filename: package/.../zlib/zlib.desc
-[COPY] Copyright (C) 2006 - 2012 The OpenSDE Project
+[COPY] Copyright (C) 2006 - 2013 The OpenSDE Project
 [COPY] Copyright (C) 2004 - 2006 The T2 SDE Project
 [COPY] Copyright (C) 1998 - 2003 Clifford Wolf
 [COPY]
@@ -38,7 +38,7 @@
 [L] OpenSource
 [S] Stable
 [V] 1.2.7
-[P] X -?-3-----9 105.900
+[P] X 0?-3-----9 105.900
 
 [D] 989677682 zlib-1.2.7.tar.bz2 http://www.zlib.net/