Fix linker big-endian support.

Fix linker big-endian support.
* elfxx-ia64.c (elfNN_ia64_relax_ldxmov): Remove abfd parameter.
(elfNN_ia64_install_value, elfNN_ia64_relax_brl): Likewise.
(elfNN_ia64_relax_section, elfNN_ia64_relocate_section,
elfNN_ia64_finish_dynamic_symbol, elfNN_ia64_finish_dynamic_sections):
Fix callers.
(elfNN_ia64_relax_brl): Change bfd_get_64 to bfd_getl64.  Change
bfd_put_64 to bfd_putl64.
(elfNN_ia64_relax_ldxmov, elfNN_ia64_install_value): Likewise.