Added entr binary to busybox image.
Added entr binary to busybox image.

berney/gentoo-bb,edannenberg/gentoo-bb,guruvan/gentoo-bb,jonasjonas/gentoo-bb,jonasjonas/gentoo-bb,edannenberg/gentoo-bb,edannenberg/kubler,gdm/gentoo-bb,guruvan/gentoo-bb,gdm/gentoo-bb,berney/gentoo-bb