RTEMS | C++ std::mutex has no error checks (#5641)

[Wayne Thornton (@wmthornton-dev)]

Wayne Thornton commented on a discussion: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5641#note_154342


Running the same test on Fedora 43 (WSL) with `uname -a` output of: `Linux THORNWM-STMD 6.18.33.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun 18 21:54:43 UTC 2026 x86_64 GNU/Linux` succeeds without a core dump or illegal instruction. 

Test output is:
`./mutex_exception
locking test
main: m1 at0x7ffe781083a0
main: lock: m1
t1: unlock: m at 0x7ffe781083a0` 

Compiled with command: `gcc -o mutex_exception mutex_exception.cpp -lstdc++ -pthread`

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5641#note_154342
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