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

[Mohamed Hassan (@Hamzi)]

Mohamed Hassan commented on a discussion on cpukit/include/rtems/confdefs/extensions.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/277#note_122594

 >    #endif
 >  #endif
 >  
 > +#ifndef CONFIGURE_STACK_CHECKER_GUARD_VALUE
 > +  #define CONFIGURE_STACK_CHECKER_GUARD_VALUE 0xDEADBEEF

@joel I Agree, moreover I think `f-stack-protector` refers to `__stack_chk_guard` but doesn't define it, RTEMS should while giving the user the ability to override it.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/277#note_122594
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