X11: Invert the Y axis #25
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It seems that on recent distribution of linux (at least, after Ubuntu 16.4), the Y axis is inverted when read from mouse file descriptor.
This PR simply invert the dy.
This issue is strange, and I think more investigation should be done. This may not be the proper solution as my cursor is slightly off compared to the system one when I use libpointing's Xorg TF. But may be that the Xorg TF was updated.