Required bootstrap binaries (sorted as in busybox menuconfig)

Archival Utilities:
- zcat
- tar
Coreutils:
- basename
- cat
- chmod
- chroot (self dep)
- cp
- dirname
- echo
- env (self dep)
- expr
- install
- ln
- ls
- mkdir
- mv
- pwd
- rm
- sleep
- sort
- touch
- tr
- true
- uniq
Editors:
- cmp
- sed
Shells:
- ash