RTEMS | Backport missing header guard and extern declarations to 6 branch (#5309)

[Kinsey Moore (@opticron)]

Kinsey Moore created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5309



The following discussion from !625 should be addressed:

- [ ] @opticron started a [discussion](https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/625#note_127117): 

    > This needs to be backported to 6 branch.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5309
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