LibBSD | random init value bug cause use ping command fail (#7)

[geng zhu (@zhugengyu2023)]

geng zhu created an issue: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/7



## Summary
<!--
Please provide as much information as possible such as error messages or attaching logs
-->

- freebsd/sbin/ping/ping.c has a bug brought when merging code from FreeBSD, where alarmtimeout、df、preload、tos has random init value and causes ping failed in some cases

```
#ifndef __rtems__
	alarmtimeout = df = preload = tos = 0;
#endif /* __rtems__ */
```

- I modified code as following and works ok now

```
#ifndef __rtems__
	alarmtimeout = df = preload = tos = 0;
#else
	df = preload = tos = 0;
#endif /* __rtems__ */

```

## Steps to reproduce

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/7
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