Update mipointer API to take a device argument to (almost) all functions,
and split miPointerAbsoluteCursor into a couple of separate functions.
Remove miPointerAbsoluteCursor call from mieq, as we now deal with it in
GetPointerEvents.
Make miPointerSetPosition (successor of miPointerAbsoluteCursor) take
pointers to x and y, so it can return the clipped values.
Modify callers of miPointer*() functions to generally use the new
functions.
This should fix things with multi-head setups.
41bb9fce47