* stabs.c (get_stab_string_offset): Always define. If SEPARATE_STAB_SECTIONS

* stabs.c (get_stab_string_offset): Always define.  If SEPARATE_STAB_SECTIONS
isn't set, abort.
(SEPARATE_STAB_SECTIONS): Default to zero.
(aout_process_stab): New function, split out from s_stab_generic.
(OBJ_PROCESS_STAB) [AOUT_STABS]: Define to call aout_process_stab, if not
already defined.
(s_stab_generic): Test SEPARATE_STAB_SECTIONS at run time.  If it's not set,
and OBJ_PROCESS_STAB isn't defined, abort.  Always pass six arguments to
OBJ_PROCESS_STAB.
* config/obj-aout.h (AOUT_STABS): Define.
* config/obj-bout.h (AOUT_STABS): Define.