Log Message:-----------Remove outdated Japanese README files per discussion.
Removed Files:------------- pgsql/contrib/pgbench: README.pgbench_jis (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/pgbench/README.pgbench_jis) pgsql/contrib/pgrowlocks: README.pgrowlocks.euc_jp (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/pgrowlocks/README.pgrowlocks.euc_jp) pgsql/contrib/pgstattuple: README.pgstattuple.euc_jp (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/pgstattuple/README.pgstattuple.euc_jp)