RTEMS | Add dladdr() support to RTEMS (!679)

[Chris Johns (@chris)]

Chris Johns commented on a discussion on cpukit/include/rtems/rtl/rtl.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/679#note_129396

 > + *
 > + * @param obj The object to get the base address for.
 > + * @return void* The base address of the object.
 > + */
 > +void* rtems_rtl_obj_base_address (const rtems_rtl_obj* obj);
 > +
 > +/**
 > + * Find the symbol closest to (but not exceeding) the given address in an object.
 > + *
 > + * @param obj The object to search in.
 > + * @param addr The address to find the closest symbol for.
 > + * @return rtems_rtl_obj_sym* The closest symbol, or NULL if none found.
 > + */
 > +rtems_rtl_obj_sym* rtems_rtl_obj_find_symbol_by_addr (const rtems_rtl_obj* obj,
 > +                                                      const void* addr);
 > +

Calls related to using the sym table are functionally grouped. Also I think `rtems_rtl_obj_find_sym_by_addr` aligns to the other sym calls and as a result I also think this call should be under `rtems_rtl_base_sym_global_add` ?

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/679#note_129396
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