wined3d: BltFast dealing correctly with overlapping src and dest (BUG: 11416)

Tue Mar 18 21:44:37 CDT 2008

IWineD3DBaseSurfaceImpl_BltFast didn't handle correctly overlapping
src and dest. which caused display corruption when scrolling to the
left or top. This happened for instance in Tzar Anthology, and
probably other RTS's.
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