i956: set RobustAccess true when is supported

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
diff --git a/src/mesa/drivers/dri/i965/brw_context.c b/src/mesa/drivers/dri/i965/brw_context.c
index af8ed2c..3085a98 100644
--- a/src/mesa/drivers/dri/i965/brw_context.c
+++ b/src/mesa/drivers/dri/i965/brw_context.c
@@ -1107,8 +1107,10 @@
       brw->perf_debug = true;
    }
 
-   if ((flags & __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS) != 0)
+   if ((flags & __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS) != 0) {
       ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_ROBUST_ACCESS_BIT_ARB;
+      ctx->Const.RobustAccess = GL_TRUE;
+   }
 
    if (INTEL_DEBUG & DEBUG_SHADER_TIME)
       brw_init_shader_time(brw);