postgresql: improved to disable zlib support if it is not installed

database/postgresql/postgresql.conf

@@ -2,7 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: package/.../postgresql/postgresql.conf
-# Copyright (C) 2006 - 2011 The OpenSDE Project
+# Copyright (C) 2006 - 2013 The OpenSDE Project
 # Copyright (C) 2004 - 2006 The T2 SDE Project
 # Copyright (C) 1998 - 2003 Clifford Wolf
 #
@@ -49,7 +49,7 @@ for x in openssl perl python; do
 	fi
 done
 
-for x in readline; do
+for x in readline zlib; do
 	if ! pkginstalled $x; then
 		var_append extraconfopt " " "--without-$x"
 	fi