make_mirror.sh: add newline at the end of /etc/hosts so that appending writes to the next line and not the current

make_mirror.sh

@@ -541,7 +541,7 @@ END
 		--customize-hook='touch "$1/mmdebstrap-testenv"' \
 		--customize-hook='copy-in "'"$tmpdir"'/mmdebstrap.service" /etc/systemd/system/' \
 		--customize-hook='copy-in "'"$tmpdir"'/worker.sh" /' \
-		--customize-hook='printf 127.0.0.1 localhost > "$1/etc/hosts"' \
+		--customize-hook='echo 127.0.0.1 localhost > "$1/etc/hosts"' \
 		--customize-hook='printf "START=1\nDAEMON_OPTS=\"-h 127.0.0.1 -p 80 -u nobody -dd /mnt/cache -i /var/run/mini-httpd.pid -T UTF-8\"\n" > "$1/etc/default/mini-httpd"' \
 		"$mirror"