Removed obsolete DROP_COLUMN_HACK stuff.

Hiroshi Inoue <inoue@tpf.co.jp>

Commit: c26a44db08677bccc04426b42973bb372e6e3046
Author: Hiroshi Inoue <inoue@tpf.co.jp>
Date: 2002-04-02T08:51:52Z
Releases: 7.3.1
Removed obsolete DROP_COLUMN_HACK stuff.

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