Tighten up SJIS byte sequence check. Now we reject invalid SJIS byte

Tatsuo Ishii <ishii@postgresql.org>

Commit: b3d0442ab3d6ebcf9d97c6e01cae0ba387209f0d
Author: Tatsuo Ishii <ishii@postgresql.org>
Date: 2006-03-04T10:57:35Z
Releases: 8.2.0
Tighten up SJIS byte sequence check. Now we reject invalid SJIS byte
sequence such as "0x95 0x27". Patches from Akio Ishida.
Also update copyright notice.

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