Partial revert of d5b66930

Tools like CRI-O or Red Hat's fork of Docker only need the OCI hook,
not the full runtime.

The hook is also likely to move at a different cadence than the full
runtime, which is tied to the upstream Docker releases.

Signed-off-by: NChristy Norman <christy@linux.vnet.ibm.com>
Signed-off-by: NFelix Abecassis <fabecassis@nvidia.com>

See https://github.com/opencontainers/runc/commit/db093f621f4e6d40feafbe6d7b89a9bee6f6ff85
We now let debuild detect and add the dependency for older versions of runc.

Signed-off-by: NChristy Norman <christy@linux.vnet.ibm.com>
Signed-off-by: NFelix Abecassis <fabecassis@nvidia.com>

Implement "-debug"