RTEMS | cpukit/error: Make RTEMS_ERROR_* shifts 16-bit host clean (!1069)

[Gedare Bloom (@gedare)]

Gedare Bloom commented on a discussion on cpukit/include/rtems/error.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1069#note_143202

 > -#define RTEMS_ERROR_ABORT  (RTEMS_ERROR_ERRNO / 4)       /* err is fatal; panic */
 > -#else
 > -#define RTEMS_ERROR_ERRNO  (0x40000000) /* hi bit; use 'errno' */
 > -#define RTEMS_ERROR_PANIC  (0x20000000) /* err fatal; no return */
 > -#define RTEMS_ERROR_ABORT  (0x10000000) /* err is fatal; panic */
 > -#endif
 > +/*
 > + * Define Error Flags
 > + */
 > +#define RTEMS_ERROR_BITS (sizeof(rtems_error_code_t) * CHAR_BIT)
 > +
 > +#define RTEMS_ERROR_ERRNO (((rtems_error_code_t)1) << (RTEMS_ERROR_BITS - 2))
 > +
 > +#define RTEMS_ERROR_PANIC (((rtems_error_code_t)1) << (RTEMS_ERROR_BITS - 3))
 > +
 > +#define RTEMS_ERROR_ABORT (((rtems_error_code_t)1) << (RTEMS_ERROR_BITS - 4))

I meant these two lines:
```suggestion:-2+0
#define RTEMS_ERROR_PANIC (RTEMS_ERROR_ERRNO >> 1)
#define RTEMS_ERROR_ABORT (RTEMS_ERROR_ERRNO >> 2)
```

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1069#note_143202
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