chore: import upstream snapshot with attribution

config.h.in

@@ -0,0 +1,24 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You 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.
+
+#ifndef  BUTIL_CONFIG_H
+#define  BUTIL_CONFIG_H
+
+#ifdef BRPC_WITH_GLOG
+#undef BRPC_WITH_GLOG
+#endif
+#cmakedefine BRPC_WITH_GLOG @WITH_GLOG_VAL@
+
+#endif  // BUTIL_CONFIG_H