winsys/amdgpu: don't allow interprocess resource sharing for IBs

Now we should get IB submissions with bo_list == NULL when DRI buffers
aren't referenced.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/gallium/winsys/amdgpu/drm/amdgpu_cs.c

@@ -575,7 +575,8 @@ static bool amdgpu_ib_new_buffer(struct amdgpu_winsys *ws, struct amdgpu_ib *ib)
 
    pb = ws->base.buffer_create(&ws->base, buffer_size,
                                ws->info.gart_page_size,
-                               RADEON_DOMAIN_GTT, 0);
+                               RADEON_DOMAIN_GTT,
+                               RADEON_FLAG_NO_INTERPROCESS_SHARING);
    if (!pb)
       return false;