Adding a return value to set_cursor_position() to allow it to report failure

[Michael Thayer]

Since I did not get feedback about whether or not this patch would be of 
interest I just went ahead and wrote it. Sadly I have missed the merge 
window for 1.16 (so I had to bump the ABI version again in the patch).

I am also thinking that my previous patch to add a return value to 
load_cursor_argb() makes the UseHWCursor*() call-backs irrelevant and 
that I should perhaps submit a patch to remove them. And on similar 
lines, is xf86ForceHWCursor() still useful? The only user seems to be 
the R128 DRI1 code.

Regards,

Michael
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