gallium: add TGSI_PROPERTY_MUL_ZERO_WINS

This will be useful for proper D3D9 emulation, where this behavior is
expected by some shaders.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Axel Davy <axel.davy@ens.fr>

src/gallium/include/pipe/p_shader_tokens.h

@@ -290,6 +290,7 @@ enum tgsi_property_name {
    TGSI_PROPERTY_CS_FIXED_BLOCK_WIDTH,
    TGSI_PROPERTY_CS_FIXED_BLOCK_HEIGHT,
    TGSI_PROPERTY_CS_FIXED_BLOCK_DEPTH,
+   TGSI_PROPERTY_MUL_ZERO_WINS,
    TGSI_PROPERTY_COUNT,
 };