[Xorg] A small wheel emulation extension

[Alex Gontmakher]

Hi,

On my laptop (Thinkpad R40), there are two scrolling devices. Having no 
need for both, I'd rather use the second one for scrolling only. 
However, the WheelEmulation works only when a button is pressed - which 
is too elaborate for just scrolling. So, I have modified the code in 
such a way that EmulateWheelButton=0 turns scrolling on without any 
button being pressed.

I would be glad if the patch was accepted into the source. The patch and 
its description can be found at 
http://www.cs.technion.ac.il/~gsasha/laptop/index.html

Alex