draw: fix flat shading and screen-space linear interpolation in clipper

This includes:
- picking up correctly which attributes are flatshaded and which are
  noperspective

- copying the flatshaded attributes when needed, including the
  non-built-in ones

- correctly interpolating the noperspective attributes in screen-space
  instead than in a 3d-correct fashion.

Signed-off-by: Olivier Galibert <[email protected]>
Reviewed-by: Brian Paul <[email protected]>

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