libzfs uses librt as a dependency. Systems with a separate / and /usrFollowing 315ee00fa961 systems with
a separate / and /usr will fail to load the libzfs.so library because librt.so is not
librt.so is not available due to the fact that /usr is not mounted yet. Install librt
Install librt in /lib making it available to libzfs.
Fixes: 315ee00fa961