Fix texture coordinate calculation in surface_blt_to_drawable

[Pablo Spallanzani]

This fixes a bug with the use of opengl to render direct draw in older
graphic cards.

The problem is in dlls/wined3d/surface.c in surface_blt_to_drawable.

3547          coords[0].x = rect.left   / This->pow2Width;

3550          coords[1].x = rect.left   / This->pow2Width;

3553          coords[2].x = rect.right  / This->pow2Width;

3556          coords[3].x = rect.right  / This->pow2Width;

3559          coords[0].y = rect.top    / This->pow2Height;
3560          coords[1].y = rect.bottom / This->pow2Height;
3561          coords[2].y = rect.bottom / This->pow2Height;
3562          coords[3].y = rect.top    / This->pow2Height;


All calculation are done with integers so when rect.right < pow2Wdith and
rect.bottom < pow2Height
all texture coordinates are set to 0 thus only the upper left pixel of the
image is displayed
scaled up to cover the entire window.
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