d3dx9_36: Implement D3DXCreatePolygon

[David Adam]

Hello,

changes from previous tries:

- simplify a computation.
- merge a loop inside an other one, since the number of sides could be huge.
- following to
http://www.winehq.org/pipermail/wine-devel/2011-August/091570.html,
D3DLOCK_DISCARD has not to be used.

A+

David
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