lib.sh: use xprintf in err()

if more than one argument is provided, it is interpreted
as a command, and the command is outputted.

this means that now for example, where you have:

ls -l foo | err "could not list directory"

you could do:

ls -l foo | err "could not list directory" "$@"

this would show all the arguments given to the calling
function that tried to run "ls"

let's say that function was called bar, you might do:

ls -l foo | err "could not list directory" bar "$@"

right now, it's not easy to provide good debug info
where err is used, unless it was called with x_, which
provides the command/arguments that was bugging out.

with this, we now have an easy and readable/maintainable
way to do the same thing everywhere in xbmk.

this will now be done, in a follow-up commit.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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