ceph.spec.in: add missing %{_libdir}/rados-classes/libcls_* files

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
Merge pull request #419 from dalgaaf/wip-da-fix-build-rados-classes

ceph.spec.in: add missing %{_libdir}/rados-classes/libcls_* files