Hi!

By popular demand a repost of the remaining futex2 bits.

Notably this is the FUTEX2_NUMA and FUTEX2_{8,16} 'small' futex support.

I'm not sure how much demand there actually is, since back-channels and
whispers don't really count. So for those of you out there on the big wide
interweb, if you want this, respond with Tested-by tags.

I know Christoph wants the NUMA bits, so I suppose that is at least one user
for this new interface, and that might see it through, but more interested
parties would be better and certainly move things along faster.

Same goes for the small futex bits, if nobody replies, they're going to get
left behind -- again!