busybox: enable to list suid and non-suid app configs
This patch, written by Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>,
adds the ability to busybox to list configuration items of suid apps
and non-suid apps separately.
`make busybox.cfg.suid' generates a file containing config items of the
suid apps.
'make busybox.cfg.nosuid' generates a file containing config items of
the non-suid apps.
This patch helps to separate busybox into two binaries, the suid one and
the non-suid one.
