RTEMS | cpukit/include/rtems/score/basedefs.h: Add RTEMS_FALL_THROUGH() (!730)

[Joel Sherrill (@joel)]

Joel Sherrill commented on a discussion on cpukit/include/rtems/score/basedefs.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/730#note_131237

 > + *
 > + * @brief This macro expands to a fall through hint.
 > + *
 > + * In C switch statement, it is possible for one case to "fall through"
 > + * to the next. Until C23, there was no standard way for the programmer
 > + * to tell the compiler this was intentional. Many times, not having
 > + * a "break" statement is an error. This macro standardizes the hint
 > + * for RTEMS source code.
 > + *
 > + * @note GCC recognizes many comment strings with "fall through" as
 > + *       a hint. But a cpp macro cannot insert a comment.
 > + */
 > +#if __STDC_VERSION__ >= 202311L
 > +  #define RTEMS_FALL_THROUGH() [[fallthrough]]
 > +#elif __GNUC__
 > +  #define RTEMS_FALL_THROUGH() __attribute__ ((fallthrough))

Discussed #5327 and we agreed on C23.

Also consider eliminating basedefs.h as much as possible when later C versions gave portable constructs.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/730#note_131237
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