[2/?] DDraw: Check the validy of IDirectDrawSurface::BltFast parameters

[Stefan Dösinger]

Some patches ago the rectangle validy check was removed from LockRect in 
wined3d because ddraw, d3d8 and d3d9 have different ideas what a valid 
rectangle is. Because bltfast in wined3d calls lockrect in wined3d ddraw has 
to do its checks before calling wined3d.

Includes a test for valid / invalid parameters. A simmilar patch for non-fast 
Blts will follow.
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