[Bug 231790] objcopy: corrupts relocation entries in big-endian mips64 output when adjusting symbol indexes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231790

--- Comment #7 from Ed Maste <emaste at freebsd.org> ---
In create_file() we create the output ELF object with elf_begin(...,
ELF_C_WRITE_, ...).

It calls _libelf_open_object where we default to the host's endianness for
e_byteorder: e->e_byteorder = LIBELF_PRIVATE(byteorder);

We set the output elf header endianness as appropriate:
        if (ecp->oed == ELFDATANONE)
                ecp->oed = ieh.e_ident[EI_DATA];
        oeh.e_ident[EI_DATA]  = ecp->oed;

Then the oeh is passed to gelf_update_ehdr, but it does not update e_byteorder;
this is done in _libelf_resync_elf().

There are several ways this could be addressed - I'm not sure what's best off
hand, but updating e_byteorder in gelf_update_ehdr might be the easiest
short-term fix.

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