RTEMS | cpukit/libio: Support close with IOP references held (!516)

[Chris Johns (@chris)]

Chris Johns created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/516

Project:Branches: chris/rtems:5201-close-optional-on-ref-count to rtems/rtos/rtems:main
Author:   Chris Johns
Assignee: Chris Johns



## Summary

cpukit/libio: Support close with IOP references held

- Provide an option for a file system to support close wtih
  references held. This can happen in more complex file systems
  and file descriptor handling with more complete reference
  handling implementations where an fd can hold other fds and
  close can be call on any fd and succeed.

- Fix open IOP leaks in the erro paths.

- Provide better definition of the IOP flags to help clarify
  the code.

Fixes #5201


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Closes #5201

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/516
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