Fix MaceEngine::Run compatibality issue

mace/core/mace.cc

@@ -556,6 +556,13 @@ MaceEngine::~MaceEngine() {
     MACE_CHECK(hexagon_controller_->Finalize(), "hexagon finalize error");
   }
 };
+
+bool MaceEngine::Run(const float *input,
+                     const std::vector<index_t> &input_shape,
+                     float *output) {
+  return Run(input, input_shape, output, nullptr);
+}
+
 bool MaceEngine::Run(const float *input,
                      const std::vector<index_t> &input_shape,
                      float *output,

mace/core/public/mace.h

@@ -360,10 +360,13 @@ class MaceEngine {
   explicit MaceEngine(const NetDef *net_def,
                       DeviceType device_type);
   ~MaceEngine();
+  bool Run(const float *input,
+           const std::vector<int64_t> &input_shape,
+           float *output);
   bool Run(const float *input,
            const std::vector<int64_t> &input_shape,
            float *output,
-           RunMetadata *run_metadata = nullptr);
+           RunMetadata *run_metadata);
   MaceEngine(const MaceEngine &) = delete;
   MaceEngine &operator=(const MaceEngine &) = delete;