Kernel prepatch 5.0-rc3

The 5.0-rc3 kernel prepatch has been
released. 'This rc is a bit bigger than usual. Partly because I missed a
networking pull request for rc2, and as a result rc3 now contains
_two_ networking pull updates. But part of it may also just be that it
took a while for people to find and then fix bugs after the holiday
season.'