update busybox to v1.2.1

openwrt/package/busybox/Makefile

openwrt/package/busybox/config/Config.in

openwrt/package/busybox/config/archival/Config.in

openwrt/package/busybox/config/console-tools/Config.in

openwrt/package/busybox/config/coreutils/Config.in

openwrt/package/busybox/config/debianutils/Config.in

openwrt/package/busybox/config/editors/Config.in

openwrt/package/busybox/config/findutils/Config.in

openwrt/package/busybox/config/init/Config.in

openwrt/package/busybox/config/loginutils/Config.in

openwrt/package/busybox/config/miscutils/Config.in

openwrt/package/busybox/config/modutils/Config.in

openwrt/package/busybox/config/networking/Config.in

openwrt/package/busybox/config/networking/udhcp/Config.in

openwrt/package/busybox/config/procps/Config.in

openwrt/package/busybox/config/shell/Config.in

openwrt/package/busybox/config/sysklogd/Config.in

openwrt/package/busybox/config/util-linux/Config.in

openwrt/package/busybox/patches/100-killall5.patch

openwrt/package/busybox/patches/110-telnetd.patch