RTEMS | Draft: libcsupport: Reimplement POSIX passwd and group entry APIs (!1250)

[彤彤 李 (@Supernb)]

彤彤 李 commented on a discussion: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1250#note_150798


I have reworked the series and force-pushed the updated version.

The new version uses the imported FreeBSD sources as the basis for the RTEMS `libcsupport/src` passwd/group implementation. The FreeBSD files under `contrib/` are kept unchanged, and the RTEMS-specific files-only changes are in the follow-up commits.

While testing the reworked version, I found and fixed one passwd parsing compatibility issue. The parser now keeps the previous RTEMS behaviour where a missing final shell field is treated as an empty string.

I also ran these checks locally:

* `./waf` for `aarch64/zynqmp_qemu`
* `rtems-test` for `psxpasswd01`, `pwdgrp01`, and `pwdgrp02` on `zynqmp_qemu`
* manual `qemu-system-aarch64` runs for the same three tests, all reaching `*** END OF TEST ... ***`
* strict compile checks for `getgrent.c` and `getpwent.c` with `-Wall -Wextra -Werror -Wmissing-prototypes -Wstrict-prototypes`
* `git diff --check origin/main..HEAD`, excluding the unchanged imported FreeBSD `contrib` files

The latest GitLab pipeline also passes.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1250#note_150798
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