RTEMS | cpukit/libcsupport: fix rename to check path length (!1095)

[Prashant Rahul (@prashantrahul141)]

Prashant Rahul created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1095

Project:Branches: prashantrahul141/rtems:cpukit/libcsupport/rename-too-long to rtems/rtos/rtems:main
Author:   Prashant Rahul



## Summary

This patchset adds 

1. `rtems_filesystem_eval_path_ctx_init` in order to reduce
repeating it in multiple places. It does very basic initialisation of
the context. For now it is used in
`rtems_filesystem_eval_path_start_with_root_and_current` and in
`_rename_r` functions.

2. `_rename_r` now correctly checks for path length before passing it to underlying filesystem.

should close #5257 

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