RTEMS | libmisc/stackchk: Add stack smashing protection (!277)

[Mohamed Hassan (@Hamzi)]

Mohamed Hassan commented on a discussion on cpukit/libmisc/stackchk/check.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/277#note_122873

 >    RTEMS_SYSINIT_ISR_STACK,
 >    RTEMS_SYSINIT_ORDER_MIDDLE
 >  );
 > +
 > +/*
 > + * This is the default implementation. The user can override it 
 > + * at the application 
 > + */
 > +RTEMS_WEAK RTEMS_NO_RETURN void __stack_chk_fail(void)

@joel conditionals were removed. I kept revising it and here is the latest update [check.c](https://gitlab.rtems.org/rtems/rtos/rtems/-/blob/66a48d2e2c473491a89db33253485fc3554ac632/cpukit/libmisc/stackchk/check.c#L607-L616).

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/277#note_122873
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