[PATCH 3/4] dinput: Fix POV calculation.

[Vitaliy Margolen]

Combine and simplify the POV calculations. Linux provides X,Y for the POV.
While DirectInput returns dial-degrees*1000 (12 o-click is 0 degrees).
---
 dlls/dinput/device_private.h      |    3 +
 dlls/dinput/joystick_linux.c      |  126 +++++++++----------------------------
 dlls/dinput/joystick_linuxinput.c |   75 ++++++++++------------
 3 files changed, 67 insertions(+), 137 deletions(-)
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