readelf: apply all rela relocations in the debug_info section

[Joern Rennecke]

Joern Rennecke wrote:
> 
> >       * 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.

P.S.: I should probably say: It breaks this test some more.  The
comparison template is already wrong, but with your patch, it doesn't
even get that far, readelf spews two warnings:
readelf: Warning: Skipping unexpected symbol type 1
readelf: Warning: Skipping unexpected symbol type 1

gdb says that these are relocations for the symbols _global and _common.
	
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