winex11.drv: Add support for AlphaBlend with non-opaque SourceConstantAlpha values.

[Ángel Guzmán Maeso]

A small change:

+int x,y;
+for (x = 0; x < widthSrc; x++, tmpBits += 4)
+    for(y=0;y<4;y++)
+        tmpBits[y] = tmpBits[y] * blendfn.SourceConstantAlpha / 255;

-- 
Shakaran
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