[Piglit] [PATCH] Test case on rendering with only fragment shader but no vertex shader.

[Ian Romanick]

Hi guys.

As my comments in Mesa bug #42461 say, this test is just plain broken. 
Specifically, the call to piglit_ortho_projection causes the draw call 
to draw a quarter pixel at the lower left corner of the window.  Since 
the probe call checks the pixel in the middle of the window, it 
naturally fails.  Deleting the call to piglit_ortho_projection causes 
the test to pass.

For the time being, I'm going to NAK the whole test.  I think we need a 
comprehensive set of "missing" stage shader tests.  I don't think adding 
a single, one-off test now does much for us.  Does that seem reasonable?