Added CERES_ prefix to the DISALLOW macros.

Change-Id: Ib81e9112e8bbc6ed6cb52f21825df0f6e659be51
diff --git a/include/ceres/cost_function.h b/include/ceres/cost_function.h
index 84403d9..9b010f7 100644
--- a/include/ceres/cost_function.h
+++ b/include/ceres/cost_function.h
@@ -119,7 +119,7 @@
   // number of outputs (residuals).
   vector<int16> parameter_block_sizes_;
   int num_residuals_;
-  DISALLOW_COPY_AND_ASSIGN(CostFunction);
+  CERES_DISALLOW_COPY_AND_ASSIGN(CostFunction);
 };
 
 }  // namespace ceres