[iperf][ntp] compiling error fix (#93)

- fix the iperf compiling error in rt-thread 5.0.x
- fix the compiling error in ntp if the RT_USING_LEGACY is not defined

Signed-off-by: Fan YANG <fan.yang@hpmicro.com>

Merge pull request #88 from mysterywolf/master

使用rt_xxx替换

Merge pull request #72 from mysterywolf/ntp

修复4.0.3版本里不能设置日期的bug

Merge pull request #60 from NightIsDark/master

修正部分情况下，tftp_server 路径名分配长度少1个字节的bug

Merge pull request #48 from enkiller/0828_1428

完善客户端文件传输请求

Merge pull request #39 from enkiller/master

【修改】调整域名地址获取失败日志等级

Merge pull request #18 from liangyongxiang/master

fixed warning: type is incompatible