trivial diff: enable duplicate elimination

[Simon Taylor]

Estimated hours taken: 0.1

compiler/rl_out.m:
	Turn on duplicate removal for sort.


Index: rl_out.m
===================================================================
RCS file: /home/staff/zs/imp/mercury/compiler/rl_out.m,v
retrieving revision 1.1
diff -u -u -r1.1 rl_out.m
--- rl_out.m	1998/12/06 23:45:37	1.1
+++ rl_out.m	1999/03/08 22:44:17
@@ -1026,8 +1026,7 @@
 	{ list__sort_and_remove_dups(Attrs, SortedAttrs) },
 	{ list__length(SortedAttrs, NumAttrs) },
 	{ list__length(OutputSchema, NumAttrs) ->
-		% Filter = 1 XXX do we want to filter duplicates?
-		Filter = 0
+		Filter = 1
 	;
 		Filter = 0
 	},