printf(1): don't use getopt, second take

printf(1): don't use getopt, second take

printf must not use getopt, since any passed string is
valid, also strings starting with -, i.e.
	printf -f%s oo
has to print "-foo" and not error out with
"illegal option".

However, if printf is passed "--" as an argument separator, we have to
discard it and may not print it.