RTEMS | waf: Invalidate build on configuration change (!1093)

[SHIVAM DEOLANKAR (@D3athSkulll)]

SHIVAM DEOLANKAR created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1093

Project:Branches: D3athSkulll/rtems:smp-repro-test to rtems/rtos/rtems:main
Author:   SHIVAM DEOLANKAR



## Summary

Switching RTEMS_SMP did not invalidate previously compiled objects,\
leading to stale object reuse and linker errors.\
\
Add a configuration fingerprint derived from ENABLE, ARCH, and BSP\
to CFLAGS so configuration changes modify the task signature and\
trigger a full rebuild.

## AI Details

I have read and agree with the RTEMS Generative AI statement: https://www.rtems.org/generative-ai/

### Prompt used

When switching from non SMP to SMP back and forth without cleaning causes linker errors in the following bsp. Suggest appropiate solutions for the same.

### AI model used

ChatGPT (GPT-5.2)

### How AI was used for the contribution

- [x] Formatting
- [ ] Test creation.
- [ ] Code comments.
- [ ] The entire contribution was generated using AI
- [ ] AI code completion such as Copilot in VSCode.

If others were used please add below

### Access

I confirm that I have not used any product that claims copyright over generated output and that I have legitimate access to the AI tools used.

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