RTEMS | Review What is Enabled by RTEMS_POSIX_API = True (#5415)

[Joel Sherrill (@joel)]

Joel Sherrill created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5415



## Summary
Issue #5412 was because a new C11 file (timespecget.c) was only built when _RTEMS_POSIX_API = True_. 

This issue is just to review what is enabled by that configuration option and verify nothing else has crept in. 

## Steps to reproduce


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5415
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