RTEMS | _Processor_mask_Find_last_set() use breaks GCC14+ builds using "-std" flags (#5501)

[SHIVAM DEOLANKAR (@D3athSkulll)]

SHIVAM DEOLANKAR commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5501#note_143813


I tried reproducing this using RTEMS 7 with riscv-rtems7-gcc 15.2.0 (Newlib).
Even with -std=c11 -Werror=implicit-function-declaration, the build succeeds.
It appears that Newlib exposes flsl() unconditionally, so the issue may be specific to certain host libc environments (e.g., glibc).

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5501#note_143813
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