st/nine: propertly declare constants (v2)
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" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>
Tested-by: David Heidelberg <aa743a0aaec8f7d7a1f01442503957f4d7a2d634@ixit.cz>
Reviewed-by: Ilia Mirkin <bcbbb7aa705ec3a5fc5824c01a845186c3d62fca@alum.mit.edu>
Signed-off-by: Axel Davy <2b6ef604b998fb81662f85c329e4fc020eae8e5d@ens.fr>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler