i965/gen6: Remove state flagging on BRW_NEW_CURBE_OFFSETS.

That flag was leftover from gen4, where brw_curbe.c is choosing ranges
of the CURBE space for constants to live in, and the unit state tells
where to load them from.  That's not the case on gen6 -- we don't set
this flag (since constants aren't in the URB), nor do we have any
state like that to upload.

src/mesa/drivers/dri/i965/gen6_gs_state.c

@@ -65,8 +65,7 @@ upload_gs_state(struct brw_context *brw)
 const struct brw_tracked_state gen6_gs_state = {
    .dirty = {
       .mesa  = _NEW_TRANSFORM,
-      .brw   = (BRW_NEW_CURBE_OFFSETS |
-		BRW_NEW_URB_FENCE |
+      .brw   = (BRW_NEW_URB_FENCE |
 		BRW_NEW_CONTEXT),
       .cache = CACHE_NEW_GS_PROG
    },

src/mesa/drivers/dri/i965/gen6_vs_state.c

@@ -165,8 +165,7 @@ upload_vs_state(struct brw_context *brw)
 const struct brw_tracked_state gen6_vs_state = {
    .dirty = {
       .mesa  = _NEW_TRANSFORM | _NEW_PROGRAM_CONSTANTS,
-      .brw   = (BRW_NEW_CURBE_OFFSETS |
-                BRW_NEW_NR_VS_SURFACES |
+      .brw   = (BRW_NEW_NR_VS_SURFACES |
 		BRW_NEW_URB_FENCE |
 		BRW_NEW_CONTEXT |
 		BRW_NEW_VERTEX_PROGRAM |

src/mesa/drivers/dri/i965/gen6_wm_state.c

@@ -209,8 +209,7 @@ const struct brw_tracked_state gen6_wm_state = {
 		_NEW_BUFFERS |
 		_NEW_PROGRAM_CONSTANTS |
 		_NEW_POLYGON),
-      .brw   = (BRW_NEW_CURBE_OFFSETS |
-		BRW_NEW_FRAGMENT_PROGRAM |
+      .brw   = (BRW_NEW_FRAGMENT_PROGRAM |
                 BRW_NEW_NR_WM_SURFACES |
 		BRW_NEW_URB_FENCE |
 		BRW_NEW_BATCH),