winejoystick.drv: Implement POV support

[Vincent Pelletier]

Note:
The code generating "discrete" values uses raw numbers istead of defined 
values, because they exist only for 4 directions and (on the contrary of what 
is advertised by MSDN) JOY_RETURNPOV also reports diagonal angles (verified 
on vista 32 bits, with joytester.exe). I believe it's easier to see the 
correlations between values this way.

TODO:
  JOYCAPS_POVCTS support, requiring some trigonometry functions and a joystick
  reporting "analog" POV coordinates.
-- 
Vincent Pelletier
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