[posix][ipc] add ipc header files

components/libc/posix/ipc/sys/ipc.h

+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-12-07     Meco Man     First version
+ */
+#ifndef __SYS_IPC_H__
+#define __SYS_IPC_H__
+
+
+
+#endif

components/libc/posix/ipc/sys/msg.h

+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-12-07     Meco Man     First version
+ */
+#ifndef __SYS_MSG_H__
+#define __SYS_MSG_H__
+
+
+
+#endif

components/libc/posix/ipc/sys/sem.h

+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-12-07     Meco Man     First version
+ */
+#ifndef __SYS_SEM_H__
+#define __SYS_SEM_H__
+
+
+
+#endif

components/libc/posix/ipc/sys/shm.h

+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-12-07     Meco Man     First version
+ */
+#ifndef __SYS_SHM_H__
+#define __SYS_SHM_H__
+
+
+
+#endif