Also remove "redbootscript" and "redbootscript.padded" junk files.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
Acked-by: Jonas Gorski <jogo@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45780 3c298f89-4303-0410-b956-a3cf2f4a3e73