Fix POSIX sh compliance

[ptrcnull]

as lddtree uses /bin/sh as its hashbang, it cannot use bashisms

i'm not really happy about the long option workaround, but couldn't find a better way to still support it (used in alpine's mkinitfs and who knows where, cannot remove)

as for the indent - posix says "For other conversion specifiers, the behavior is undefined." when the precision argument is 0, so we should avoid that

[ptrcnull]

one other workaround, one that works with spaces in the arguments is:

case "$@" in *"--no-auto-root"*)
	local args=""
	for arg; do
		if [ "$arg" = "--no-auto-root" ]; then
			args="$args -N"
		else
			args="$args '$arg'"
		fi
	done
	eval set -- $args
	;;
esac

but that introduces eval instead..

[ncopa]

I fixed this differently. thanks!

• long opts: 7414e62
• indent fix: 3a0b9cd

[ptrcnull]

thanks! that's indeed better than what i came up with