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

[Gedare Bloom (@gedare)]

Gedare Bloom commented on a discussion on cpukit/libmisc/stackchk/check.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/277#note_114913

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

I think so. A quick investigation suggests you could probably mimic the `spec/build/cpukit/optcoveragecflags.yml` and `spec/build/cpukit/optnocoveragecflags.yml` but I'm not 100% sure this is the right thing to do.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/277#note_114913
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