* sysdeps/s390/s390-32/backtrace.c (init): Guard with #ifdef SHARED.
(unwind_backtrace, unwind_getip): Define #ifndef SHARED.
(__backtrace): Don't call init #ifndef SHARED.
* sysdeps/s390/s390-64/backtrace.c (init): Guard with #ifdef SHARED.
(unwind_backtrace, unwind_getip): Define #ifndef SHARED.
(__backtrace): Don't call init #ifndef SHARED.
* sysdeps/ia64/backtrace.c (init): Guard with #ifdef SHARED.
(unwind_backtrace, unwind_getip): Define #ifndef SHARED.
(__backtrace): Don't call init #ifndef SHARED.