py-smbus/Module.mk: Install with PREFIX defined

If we are building to a defined destdir py-smbus is going to ignore this
and try install to the actual root. This breaks packaging setups as the
install section would fail.

Signed-off-by: Morten Linderud <morten@linderud.pw>
Signed-off-by: Jean Delvare <jdelvare@suse.de>
1 file changed