Remove outdated Japanese README files per discussion.

Tatsuo Ishii <ishii@postgresql.org>

Commit: 40e01e267d114ea0d801606e5afac9c16fff37d7
Author: Tatsuo Ishii <ishii@postgresql.org>
Date: 2009-01-06T13:43:31Z
Releases: 8.4.0
Remove outdated Japanese README files per discussion.

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