busybox

applets/install: respect noclobber for script wrappers too

Simplify the handling of --noclobber so that it applies to all types of
installation types, even to script wrappers.

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>