RTEMS | confdefs/newlib: error on CONFIGURE_DISABLE_NEWLIB_REENTRANCY with TLS newlib (!1569)

[Aaditya Agarwal (@aaditya8979)]

Aaditya Agarwal created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1569

Project:Branches: aaditya8979/rtems:newlib-tls-conflict to rtems/rtos/rtems:main
Author: Aaditya Agarwal

## Summary

`CONFIGURE_DISABLE_NEWLIB_REENTRANCY` assumes newlib invokes `__getreent()` to obtain the per-thread reentrancy structure. When newlib is built with `_REENT_THREAD_LOCAL`, reentrancy data is accessed directly through thread-local storage, making the callback moot and the option a silent no-op.

Add a `#error` in `<rtems/confdefs/newlib.h>` when both `CONFIGURE_DISABLE_NEWLIB_REENTRANCY` and `_REENT_THREAD_LOCAL` are defined so configuration conflicts are caught at compile time.

Closes #5781.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1569
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