Revert "Use a bitmask to represent role attributes"

This reverts commit 1826987a46.

The overall design was deemed unacceptable, in discussion following the
previous commit message; we might find some parts of it still
salvageable, but I don't want to be on the hook for fixing it, so let's
wait until we have a new patch.

src/backend/replication/slotfuncs.c

@@ -20,14 +20,13 @@
 #include "replication/slot.h"
 #include "replication/logical.h"
 #include "replication/logicalfuncs.h"
-#include "utils/acl.h"
 #include "utils/builtins.h"
 #include "utils/pg_lsn.h"
 
 static void
 check_permissions(void)
 {
-	if (!have_role_attribute(ROLE_ATTR_REPLICATION))
+	if (!superuser() && !has_rolreplication(GetUserId()))
 		ereport(ERROR,
 				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
 				 (errmsg("must be superuser or replication role to use replication slots"))));