col(1) on OpenBSD

The text 4911fc93a35b, as OpenBSD 5.6, OpenBSD 5.5, OpenBSD 5.4, OpenBSD 5.3, OpenBSD 5.2, OpenBSD 5.1, OpenBSD 5.0, OpenBSD 4.9 shipped it.

filter reverse line feeds and backspaces from input

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