RTEMS | rtems_clock_get_tod: Cannot obtain dates later than 2100 (#5143)

[Joel Sherrill (@joel)]

Joel Sherrill created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5143



## Summary
The method rtems_clock_get_tod() uses its own math to fill in the rtems_time_of_day structure. Its calculations should be replaced with a call to gmtime() which can handle leap years better. This will replace time/date math with a more robust implementation which likely handles edge cases better. 

Review #4338 (rtems_clock_set(): Cannot set future dates later than approximately 2105) to ensure that the cases it cites are still ok.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5143
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