Clean up CREATE FUNCTION syntax usage in contrib and elsewhere, in

particular get rid of single quotes around language names and old WITH ()
construct.

contrib/spi/autoinc.sql.in

@@ -4,4 +4,4 @@ SET search_path = public;
 CREATE OR REPLACE FUNCTION autoinc() 
 RETURNS trigger 
 AS 'MODULE_PATHNAME'
-LANGUAGE 'C';
+LANGUAGE C;

contrib/spi/insert_username.sql.in

@@ -4,4 +4,4 @@ SET search_path = public;
 CREATE OR REPLACE FUNCTION insert_username() 
 RETURNS trigger 
 AS 'MODULE_PATHNAME'
-LANGUAGE 'C';
+LANGUAGE C;

contrib/spi/moddatetime.sql.in

@@ -4,4 +4,4 @@ SET search_path = public;
 CREATE OR REPLACE FUNCTION moddatetime()
 RETURNS trigger
 AS 'MODULE_PATHNAME'
-LANGUAGE 'C';
+LANGUAGE C;

contrib/spi/refint.sql.in

@@ -4,9 +4,9 @@ SET search_path = public;
 CREATE OR REPLACE FUNCTION check_primary_key()
 RETURNS trigger
 AS 'MODULE_PATHNAME'
-LANGUAGE 'C';
+LANGUAGE C;
 
 CREATE OR REPLACE FUNCTION check_foreign_key()
 RETURNS trigger
 AS 'MODULE_PATHNAME'
-LANGUAGE 'C';
+LANGUAGE C;

contrib/spi/timetravel.sql.in

@@ -1,19 +1,17 @@
 -- Adjust this setting to control where the objects get created.
 SET search_path = public;
 
-SET autocommit TO 'on';
-
 CREATE OR REPLACE FUNCTION timetravel() 
 RETURNS trigger 
 AS 'MODULE_PATHNAME'
-LANGUAGE 'C';
+LANGUAGE C;
 
 CREATE OR REPLACE FUNCTION set_timetravel(name, int4) 
 RETURNS int4 
 AS 'MODULE_PATHNAME'
-LANGUAGE 'C' WITH (isStrict);
+LANGUAGE C RETURNS NULL ON NULL INPUT;
 
 CREATE OR REPLACE FUNCTION get_timetravel(name) 
 RETURNS int4 
 AS 'MODULE_PATHNAME'
-LANGUAGE 'C' WITH (isStrict);
+LANGUAGE C RETURNS NULL ON NULL INPUT;