BUG #1183: order by ignoring whitespaces on collate pt_BR

The following bug has been logged online:

Bug reference:      1183
Logged by:          Everton Luis Berz

Email address:      everton@faccat.br

PostgreSQL version: 7.4

Operating system:   Linux Slackware 9.1

Description:        order by ignoring whitespaces on collate pt_BR

Details:

The order by is ignoring whitespaces.
Follow example:

  # select codigo, nome from usa_nalu where nome ilike 'maria%' ORDER BY
  NOME;
  (...)
    codigo  | nome
  ----------+-------------------------------
  003414   | MARIA NILDA DA SILVA E SILVA
  1040534  | MARIA NILZA GOMES GRASSMANN
  503/0028 | MARIAN MINEGAS
  10305081 | MARIANO ANDRE ANDERSON
  871104   | MARIANO DE CASTILHOS PETERSEN
  001726   | MARIA NOELI ZIMMER CLEMENT
  931129   | MARIA ODETE DA SILVA APOLLO
  002351   | MARIA ONEIDE DO AMARAL
  (...)

MARIA-MARIAN-MARIANO-MARIA again?

My configuration is:
 # select name, setting from pg_settings where name in
  ('client_encoding', 'server_encoding', 'lc_collate');
        name       | setting
  -----------------+---------
  client_encoding | LATIN1
  lc_collate      | pt_BR
  server_encoding | LATIN1