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

[Mohamed Hassan (@Hamzi)]

Mohamed Hassan commented on a discussion on testsuites/libtests/stackchk06/config.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/277#note_122877

 > +
 > +#include <rtems.h>
 > +#include <rtems/score/thread.h>
 > +#include <rtems/bspIo.h>
 > +
 > +const char rtems_test_name[] = "STACKCHK06";
 > +
 > +RTEMS_NO_RETURN void __stack_chk_fail(void);
 > +
 > +/* configuration information */
 > +#define CONFIGURE_STACK_CHECKER_ENABLED
 > +
 > +RTEMS_NO_RETURN void __stack_chk_fail(void)
 > +{
 > +  // Custom handling for stack overflow
 > +  printk("Custom stack overflow handler invoked\n");

`.scn` file are updated [stackchk05.scn](https://gitlab.rtems.org/rtems/rtos/rtems/-/blob/99518a75903843c274fe264433fc7a4dce026c31/testsuites/libtests/stackchk05/stackchk05.scn) and [stackchk06.scn](https://gitlab.rtems.org/rtems/rtos/rtems/-/blob/99518a75903843c274fe264433fc7a4dce026c31/testsuites/libtests/stackchk06/stackchk06.scn). And the `.doc` were updated before. If you spot anything, I'll sort it out.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/277#note_122877
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