remove stages 3-5

stage5/EXPORT_IMAGE

@@ -1,4 +0,0 @@
-IMG_SUFFIX=""
-if [ "${USE_QEMU}" = "1" ]; then
-	export IMG_SUFFIX="${IMG_SUFFIX}-qemu"
-fi

stage5/EXPORT_NOOBS

@@ -1,2 +0,0 @@
-NOOBS_NAME="Raspbian"
-NOOBS_DESCRIPTION="A port of Debian Stretch for the Raspberry Pi (full desktop version)"

stage5/prerun.sh

@@ -1,5 +0,0 @@
-#!/bin/bash -e
-
-if [ ! -d ${ROOTFS_DIR} ]; then
-	copy_previous
-fi