Revise handling of oldstyle/newstyle functions per recent discussions

in pghackers list.  Support for oldstyle internal functions is gone
(no longer needed, since conversion is complete) and pg_language entry
'internal' now implies newstyle call convention.  pg_language entry
'newC' is gone; both old and newstyle dynamically loaded C functions
are now called language 'C'.  A newstyle function must be identified
by an associated info routine.  See src/backend/utils/fmgr/README.

contrib/noupdate/noup.c

@@ -16,6 +16,8 @@ extern Datum noup(PG_FUNCTION_ARGS);
  * EXECUTE PROCEDURE noup ('col').
  */
 
+PG_FUNCTION_INFO_V1(noup);
+
 Datum
 noup(PG_FUNCTION_ARGS)
 {

contrib/noupdate/noup.sql.in

@@ -3,5 +3,4 @@ DROP FUNCTION noup ();
 CREATE FUNCTION noup ()
 	RETURNS opaque
 	AS 'MODULE_PATHNAME'
-	LANGUAGE 'newC'
-;
+	LANGUAGE 'C';