chore: import upstream snapshot with attribution

paddle/phi/api/include/dll_decl.h

@@ -0,0 +1,27 @@
+// Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#if defined(_WIN32) && !defined(STATIC_PADDLE)
+#ifndef PADDLE_API
+#ifdef PADDLE_DLL_EXPORT
+#define PADDLE_API __declspec(dllexport)
+#else
+#define PADDLE_API __declspec(dllimport)
+#endif  // PADDLE_DLL_EXPORT
+#endif  // PADDLE_API
+#else
+#define PADDLE_API
+#endif  // _WIN32