[Bug 57984] r300g: blend sfactor=GL_DST_COLOR fails with FBOs

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Comment # 1 on bug 57984 from
I dug through the optimizations in r300_create_blend_state, and the problem is
the "Disable reading if SRC_ALPHA == 0" optimization. It is not correct if the
source factor is DEST_COLOR. I'm checking if any other source factors have to
be excluded.


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