New configuration scheme changes, round 2 (virtual pkgs).

- XBPS now expects to read individual virtual pkg settings from
  .plist files in PREFIX/etc/xbps/virtualpkg.d.wants.

This really implements the missing part in issue #12 in
googlecode: http://code.google.com/p/xbps/issues/detail?id=12

lib/plist_find.c

@@ -127,11 +127,10 @@ find_virtualpkg_user_in_conf(const char *vpkg, bool bypattern)
 	char *vpkgname = NULL;
 
 	xhp = xbps_handle_get();
-	if (xhp->virtualpkg_dictionary == NULL)
+	if (prop_object_type(xhp->virtualpkgs_array) != PROP_TYPE_ARRAY)
 		return NULL;
 
-	if ((iter = xbps_array_iter_from_dict(xhp->virtualpkg_dictionary,
-	    "virtual-packages")) == NULL)
+	if ((iter = prop_array_iterator(xhp->virtualpkgs_array)) == NULL)
 		return NULL;
 
 	while ((obj = prop_object_iterator_next(iter)) != NULL) {