clone: allow CLONE_THREAD | CLONE_PIDFD together

This removes the restriction of CLONE_THREAD | CLONE_PIDFD being specified
together. Assuming the previous patch sorts out all the thorny issues this
should be safe. I've left it as a separate patch since it is not strictly
necessary as a usecase for us, but might be nice? Perhaps we want to wait
until someone actually needs it though.

Signed-off-by: Tycho Andersen <tandersen@netflix.com>