Fix breakage induced by commits d8d3d2a4
and 463f2625: pg_dumpall has crashed when
attempting to dump from pre-8.1 servers since then, due to faulty
construction of the query used for dumping roles from older servers.
The query was erroneous as of the earlier commit, but it wasn't exposed
unless you tried to use --binary-upgrade, which you presumably wouldn't
with a pre-8.1 server.  However commit 463f2625 made it fail always.

In HEAD, also fix additional breakage induced in the same query by
commit 491c029d, which evidently wasn't
tested against pre-8.1 servers either.

The bug is only latent in 9.1 because 463f2625 hadn't landed yet, but
it seems best to back-patch all branches containing the faulty query.

Gilles Darold