mesa: added internal post color matrix scale/bias vars

cherry-picked from gallium-0.1 (302daeb2ec62c59bd28d0c53cdc0fb07dc9d0f58)
diff --git a/src/mesa/shader/prog_statevars.h b/src/mesa/shader/prog_statevars.h
index 22bb8e0..53529ab 100644
--- a/src/mesa/shader/prog_statevars.h
+++ b/src/mesa/shader/prog_statevars.h
@@ -108,6 +108,10 @@
    STATE_POSITION_NORMALIZED,   /* normalized light position */
    STATE_FOG_PARAMS_OPTIMIZED,  /* for faster fog calc */
    STATE_SPOT_DIR_NORMALIZED,   /* pre-normalized spot dir */
+   STATE_PT_SCALE,              /**< Pixel transfer RGBA scale */
+   STATE_PT_BIAS,               /**< Pixel transfer RGBA bias */
+   STATE_PCM_SCALE,             /**< Post color matrix RGBA scale */
+   STATE_PCM_BIAS,              /**< Post color matrix RGBA bias */
    STATE_INTERNAL_DRIVER	/* first available state index for drivers (must be last) */
 } gl_state_index;