r600g: let radeon_winsys maintain the list of relocations

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/src/gallium/winsys/r600/drm/r600_priv.h b/src/gallium/winsys/r600/drm/r600_priv.h
index 49d3060..baf7c98 100644
--- a/src/gallium/winsys/r600/drm/r600_priv.h
+++ b/src/gallium/winsys/r600/drm/r600_priv.h
@@ -65,6 +65,7 @@
 struct radeon_bo {
 	struct pipe_reference		reference;
 	struct pb_buffer		*buf;
+	struct radeon_winsys_cs_handle	*cs_buf;
 	unsigned			handle;
 	unsigned			size;
 	int				map_count;