zink: regression after !7195
After 0b2475f5, we no longer pass a bunch of related piglit test on ANV.
One example is spec@glsl-1.50@execution@geometry@primitive-id-restart gl_line_loop ffs
.
In fact, it seems we're failing all spec@glsl-1.50@execution@geometry@primitive-id-restart
tests, apart from the gl_line_strip
, gl_triangle_fan
and gl_triangle_strip
variants.