drbd-utils: fix multilib problem

If multilib is enabled, errors about 'installed-not-shipped' would appear.
This patch fixes this problem.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>