Remove TOAST table from pg_database

The only toastable column now is datacl, but we don't really support
long ACLs anyway.  The TOAST table should have been removed when the
pg_db_role_setting catalog was introduced in commit
2eda8dfb52, but I forgot to do that.

Per -hackers discussion on March 2011.

src/backend/catalog/catalog.c

@@ -402,9 +402,7 @@ IsSharedRelation(Oid relationId)
 		relationId == DbRoleSettingDatidRolidIndexId)
 		return true;
 	/* These are their toast tables and toast indexes (see toasting.h) */
-	if (relationId == PgDatabaseToastTable ||
-		relationId == PgDatabaseToastIndex ||
-		relationId == PgShdescriptionToastTable ||
+	if (relationId == PgShdescriptionToastTable ||
 		relationId == PgShdescriptionToastIndex ||
 		relationId == PgDbRoleSettingToastTable ||
 		relationId == PgDbRoleSettingToastIndex)

src/include/catalog/catversion.h

@@ -53,6 +53,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	201202271
+#define CATALOG_VERSION_NO	201203011
 
 #endif

src/include/catalog/toasting.h

@@ -50,9 +50,6 @@ DECLARE_TOAST(pg_statistic, 2840, 2841);
 DECLARE_TOAST(pg_trigger, 2336, 2337);
 
 /* shared catalogs */
-DECLARE_TOAST(pg_database, 2844, 2845);
-#define PgDatabaseToastTable 2844
-#define PgDatabaseToastIndex 2845
 DECLARE_TOAST(pg_shdescription, 2846, 2847);
 #define PgShdescriptionToastTable 2846
 #define PgShdescriptionToastIndex 2847