fix(Macos): fix compile on macos

reyoung · reyoung · commit b3364d40350c · 2018-11-21T10:07:27.000+08:00
test=develop
diff --git a/paddle/fluid/memory/allocation/best_fit_allocator_test.cc b/paddle/fluid/memory/allocation/best_fit_allocator_test.cc
@@ -13,6 +13,7 @@
 // limitations under the License.
 
 #include "paddle/fluid/memory/allocation/best_fit_allocator.h"
+#include <random>
 #include <thread>  // NOLINT
 #include <vector>
 #include "gtest/gtest.h"
diff --git a/paddle/fluid/memory/allocation/best_fit_allocator_test.cu b/paddle/fluid/memory/allocation/best_fit_allocator_test.cu
@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include <random>
 #include <thread>  // NOLINT
 #include <vector>
 #include "gtest/gtest.h"
