Remove DROPs from contrib object creation scripts, per Dave Page.

contrib/intagg/int_aggregate.sql.in

@@ -15,9 +15,8 @@ RETURNS int4[]
 AS 'MODULE_PATHNAME','int_agg_final_array'
 LANGUAGE 'C' IMMUTABLE STRICT;
 
--- The aggration funcion.
+-- The aggregate function itself
 -- uses the above functions to create an array of integers from an aggregation.
-DROP AGGREGATE int_array_aggregate(int4);
 CREATE AGGREGATE int_array_aggregate (
 	BASETYPE = int4,
 	SFUNC = int_agg_state,

contrib/pgstattuple/pgstattuple.sql.in

 -- Adjust this setting to control where the objects get created.
 SET search_path = public;
 
-DROP TYPE pgstattuple_type CASCADE;
 CREATE TYPE pgstattuple_type AS (
 	table_len BIGINT,		-- physical table length in bytes
 	tuple_count BIGINT,		-- number of live tuples