RandR transform patch series

[Keith Packard]

Here's a patch series which adds projective transform support to the X
server RandR extension support. The library and protocol bits are not
included in this sequence.

This was rebased to master today, so it should be fairly current. Note that
it requires the 'transform-proposal' branches from the randrproto, xrandr
and libXrandr repositories to do anything useful.