Merge pull request #2005 from ErnestChen1/master

[unite] header of process

include/libc/libc_signal.h

@@ -2,10 +2,6 @@
  * Copyright (c) 2006-2018, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
- */
-
-/*
- * File      : libc_signal.h
  *
  * Change Logs:
  * Date           Author       Notes