Merge branch 'add-header-protect' into 'master'

Add header guard for mace_engine_factory.h

See merge request !839

mace/python/tools/mace_engine_factory.h.jinja2

@@ -14,6 +14,8 @@
 
 // This is a generated file. DO NOT EDIT!
 
+#ifndef MACE_CODEGEN_ENGINE_MACE_ENGINE_FACTORY_H_
+#define MACE_CODEGEN_ENGINE_MACE_ENGINE_FACTORY_H_
 #include <map>
 #include <memory>
 #include <string>
@@ -100,3 +102,4 @@ MaceStatus CreateMaceEngineFromCode(
 }
 
 }  // namespace mace
+#endif  // MACE_CODEGEN_ENGINE_MACE_ENGINE_FACTORY_H_