[posix][io]整理posix/io文件夹 (#5539)

* [posix][io]整理posix/io文件夹
- 将select.c移入到poll文件夹
- 将libc.c移入到tty文件夹，isatty函数归并到libc.c中, termios并入tty文件夹中
- 整理Sconscript

Signed-off-by: Meco Man <[email protected]>

* [libc][newlib]调整文件夹结构

1 files changed, 0 insertions, 53 deletions

diff --git a/components/libc/compilers/gcc/newlib/dlsyms.c b/components/libc/compilers/gcc/newlib/dlsyms.c
deleted file mode 100644
index e6ca23b393..0000000000
--- a/components/libc/compilers/gcc/newlib/dlsyms.c
+++ /dev/null
@@ -1,53 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2017/10/15     bernard      the first version
- */
-
-#include <rtthread.h>
-#include <rtm.h>
-
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-RTM_EXPORT(strcpy);
-RTM_EXPORT(strncpy);
-RTM_EXPORT(strlen);
-RTM_EXPORT(strcat);
-RTM_EXPORT(strstr);
-RTM_EXPORT(strchr);
-RTM_EXPORT(strcmp);
-RTM_EXPORT(strtol);
-RTM_EXPORT(strtoul);
-RTM_EXPORT(strncmp);
-
-RTM_EXPORT(memcpy);
-RTM_EXPORT(memcmp);
-RTM_EXPORT(memmove);
-RTM_EXPORT(memset);
-RTM_EXPORT(memchr);
-
-RTM_EXPORT(putchar);
-RTM_EXPORT(puts);
-RTM_EXPORT(printf);
-RTM_EXPORT(sprintf);
-RTM_EXPORT(snprintf);
-
-RTM_EXPORT(fwrite);
-
-#include <setjmp.h>
-RTM_EXPORT(longjmp);
-RTM_EXPORT(setjmp);
-
-RTM_EXPORT(exit);
-RTM_EXPORT(abort);
-
-RTM_EXPORT(rand);
-
-#include <assert.h>
-RTM_EXPORT(__assert_func);