Run the hooks under every POSIX shell present

Only sh, dash, ksh and bash were tried, so busybox sh ran only where it
is /bin/sh, and mksh, yash, posh and zsh's sh mode never ran. Where sh
is a link to dash, the same shell ran twice. A shell reached by two
names now runs once, and the list is said so a run shows what it
covered.

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