Bug#487256: cryptsetup: add dep-scripts option to crypttab

[Christoph Anton Mitterer]

Stupid me, this:
#!/bin/sh
PREREQ=""
prereqs()
{
        echo "$PREREQ"
}

case $1 in
        prereqs)
                prereqs
                exit 0
                ;;
        esac

only works with hooks,... right?

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