[busybox] Let oldconfig guys to choose too. Not everybody do use menuconfig.

[Douglas Mencken]

I'm about this option: `Default password encryption method (passwd -a,
cryptpw -m parameter) (FEATURE_DEFAULT_PASSWD_ALGO) [des] (NEW)'

What to choose? Except default one?

>From ./loginutils/Config.src (I found that by find -print0 | xargs -0
grep): Possible choices are "d[es]", "m[d5]", "s[ha256]" or "sha512".
<< This is only available for those who can read Help stuff via
menuconfig. Please, never place "possible choices" so deep.