Kernel prepatch 4.7-rc2

The second 4.7 prepatch is now availablefor testing. Linus says: "There's a late non-fix I took even thoughthe merge window is over, because I've been wanting it for a while. I doubtanybody notices the actual effects of a pty change/cleanup that means thatour old disgusting DEVPTS_MULTIPLE_INSTANCES kernel config option is gone,because the cleanup means that it is no longer needed." For detailson this change, see this article from lastweek's Kernel Page.