RTEMS | timespecaddto.c: Use of 32-bit time_t (#5107)

[Joel Sherrill (@joel)]

Joel Sherrill created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5107

Assignee: Joel Sherrill

## Summary

Coverity CID 1512527

Coverity spotted this where time_t variables/structure elements are assigned to uint32_t. Notice that the return type is uint32_t which propagates to callers of this such as rtems_timespec_add_to(). 

```
46 uint32_t _Timespec_Add_to(
47  struct timespec       *time,
48  const struct timespec *add
49)
50{
    	
CID 1512527: (#1 of 1): Use of 32-bit time_t (Y2K38_SAFETY)
1. store_truncates_time_t: A time_t value is stored in an integer with too few bits to accommodate it. The expression add->tv_sec is cast to uint32_t.
51  uint32_t seconds = add->tv_sec;
```

## Steps to reproduce

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5107
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