Ptr accel API changes

[Simon Thum]

Hi,

I would like to see the first of the attached patches in the server 
before 1.7 is branched. This is to have the accel API be sensible enough 
to finally solve the synaptics-and-acceleration problem hiding in its 
corner since the jura, approximately. The synaptics accel code (or the 
driver as a whole) could be depending on 1.7 then, so this has my priority.

The second patch applies X_INTERNAL to a few functions in ptrveloc.h (a 
SDK header) which were X_EXPORT previously. This is just because calling 
them from a driver doesn't make sense, but we need them across the 
server. This has low priority, and I'm a bit unsure how to handle it. 
Comments welcome.

In any case, I'm unaware of current users of ptrveloc.h, so changes are 
breaking.

Cheers,

Simon
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