readelf: apply all rela relocations in the debug_info section

[Joern Rennecke]

>       * readelf.c (display_debug_info): Apply RELA relocations on the
>       entire section.
>       (byte_put_little_endian, byte_put_big_endian): New functions.
>       (byte_put): New variable.
>       (get_file_header): Initialize it.

This breaks the readelf -wi test for sh-elf.

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