Documentation | posix-compliance: Update for C23 and C11 Annex K support (!254)

[Joel Sherrill (@joel)]

Joel Sherrill created a merge request: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/254

Project:Branches: joel/rtems-docs:main-add-c23-and-annex-k to rtems/docs/rtems-docs:main
Author:   Joel Sherrill
Assignee: Joel Sherrill


## Summary

posix-compliance: Update for C23 and C11 Annex K support

C11 and later include Annex K ("Bounds-checking interfaces") which
provides alternative versions of some Standard C Library functions
intended to avoid programming errors related to buffer overflow.
RTEMS support for these functions comes from the project safeclib.

Columns were added for C23 along with the optional math funcitons
supporting IEC 60559 BFP and IEC 60559 DFP for binary and decimal
floating point.

Closes #156.


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