Revert "use prebuilt busybox"

This reverts commit 92fadf916b06b36f84ab3cc8bfea0af7b3ce6c8f.
Revert "use prebuilt busybox and bootmenu binaries"

This reverts commit 738520cd34f82d767854c5c7057e6c80a8b31092.
Revert "use prebuilt recovery"

This reverts commit 492868b09a5c79400a52bc013bb0b098def5f6ba.