2/2 winex11: move scaling to xrender_blit

[Roderick Colenbrander]

Hi,

This patch moves calculation of the scaling factor to xrender_blit.
The goal is to use xrender_blit in the end from both
X11DRV_GetSrcAreaStretch, AlphaBlend and other places. xrender_blit
will decide by itself what the fastest rendering method is e.g.
blitting or tiling.

Regards,
Roderick Colenbrander
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