RTEMS | fcntl(F_DUP2FD) onto a free descriptor yields a dead descriptor and leaves its iop on the free list (#5670)

[Chris Johns (@chris)]

Chris Johns commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5670#note_156133


I will refactor the `pipe()` call to support an indirect handler so a new handler can be registered to allow support for other types of file descriptors.

See https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/153#note_155890 for details on the decision to make this change.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5670#note_156133
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