radeon: avoid rounding errors in texture coords for textured xv

make sure the division is done with floats, otherwise the coordinate
can be wrong up to 1 texel.
Particularly visible with clipping and small source scaled up (since one
texel can be a shift of several pixels) but could be seen even unscaled.
Should provide more accurate coords without clipping too depending on the
scale factor probably.
Changed for r100-r600, though only tested on r300.

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