Add Convertor function for windows enviroment

mindspore/lite/src/runtime/kernel/arm/nnacl/optimized_kernel.h

@@ -62,10 +62,10 @@ class OptimizeModule {
     }
 #ifndef _WIN32
     optimized_op_handler_ = dlopen(OPTIMIZE_SHARED_LIBRARY_PATH, RTLD_LAZY);
-#endif
     if (optimized_op_handler_ == nullptr) {
       printf("Open optimize shared library failed: %s\n", dlerror());
     }
+#endif
   }
 
   ~OptimizeModule() = default;