Prevent segfault in GDB when searching for architecture matches.
* format.c (struct bfd_preserve): New "build_id" field. (bfd_preserve_save): Save "build_id". (bfd_preserve_restore): Restore "build_id".
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* format.c (struct bfd_preserve): New "build_id" field. (bfd_preserve_save): Save "build_id". (bfd_preserve_restore): Restore "build_id".