The following patch fixes the problem with building the latest
ia64-tdep.c with --without-libunwind configured.  It also removes
warnings about gdb_byte vs void *.

2005-06-09  Jeff Johnston  <jjohnstn@redhat.com>
                                                                                
        * ia64-tdep.c (ia64_pseudo_register_read): Use gdb_byte and
        protect libunwind references with HAVE_LIBUNWIND_IA64_H flag.
        * (ia64_pseudo_register_write): Use gdb_byte to remove warning.
        * (ia64_register_to_value, ia64_value_to_register): Ditto.
        * (ia64_frame_prev_register): Ditto.
        * (ia64_libunwind_frame_prev_register): Ditto.
        * (ia64_sigtramp_frame_prev_register): Ditto.
        * (ia64_libunwind_sigtramp_frame_prev_register): Ditto.
        * (ia64_store_return_value): Ditto.