Remove incorrect STRICT properties from aggregate final functions

Author: david-rowley

contrib/fixeddecimal/fixeddecimal--aggs.sql

@@ -10,12 +10,12 @@ LANGUAGE C IMMUTABLE;
 CREATE FUNCTION fixeddecimal_sum(INTERNAL)
 RETURNS FIXEDDECIMAL
 AS 'fixeddecimal', 'fixeddecimal_sum'
-LANGUAGE C IMMUTABLE STRICT;
+LANGUAGE C IMMUTABLE;
 
 CREATE FUNCTION fixeddecimal_avg(INTERNAL)
 RETURNS FIXEDDECIMAL
 AS 'fixeddecimal', 'fixeddecimal_avg'
-LANGUAGE C IMMUTABLE STRICT;
+LANGUAGE C IMMUTABLE;
 
 CREATE AGGREGATE min(FIXEDDECIMAL) (
     SFUNC = fixeddecimalsmaller,