pgsql: In pg_upgrade, fix bug where no users were dumped in pg_dumpall

In pg_upgrade, fix bug where no users were dumped in pg_dumpall
binary-upgrade mode; instead only skip dumping the current user.

This bug was introduced in during the removal of split_old_dump(). Bug
discovered during local testing.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/db00d837c17cebf3769fd3b6655812e2d3776f5d

Modified Files
--------------
src/bin/pg_dump/pg_dumpall.c | 23 +++++++++++++++--------
1 files changed, 15 insertions(+), 8 deletions(-)

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