RTEMS | bsps/powerpc: Undef BSP_SHARED_HANDLER_SUPPORT before defining it again (!498)

[Jeremy Lorelli (@jjl77)]

Jeremy Lorelli created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/498

Project:Branches: jjl77/rtems:pr-fix-macro-redefs to rtems/rtos/rtems:main
Author:   Jeremy Lorelli




## Summary

bsps/powerpc: Undef BSP_SHARED_HANDLER_SUPPORT before defining it again

Fixes macro redefinition warnings in a few BSPs.


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/498
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