d3d8: add very simple test for ValidateVertexShader

[Louis. Lenders]

One tiny correction: an application that passes a '1' as 4th parameter is not http://www.codesampler.com/source/dx8_vs11_shader_simple.zip 
but http://www.codesampler.com/source/dx8_cg_vertex_displacement.zip

It's exactly that what seems to cause the crashes. See the crash log in 
http://bugs.winehq.org/attachment.cgi?id=1357&action=view
for another example.

 		
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