st/nine: propertly declare constants (v2)
Fixes "Error : CONST[20]: Undeclared source register" when running dx9_alpha_blending_material. Also artifacts on ilo. v2: also remove unused MISC_CONST Cc: "10.4" <mesa-stable@lists.freedesktop.org> Tested-by:David Heidelberg <david@ixit.cz> Reviewed-by:
Ilia Mirkin <imirkin@alum.mit.edu> Signed-off-by:
Axel Davy <axel.davy@ens.fr>