Incomplete 64K section support

[H. J. Lu]

Hi Alan,

64K section support is incomplete. The basically problem is index
in ELF file != index in internal BFD representation. We have to adjust
them for 64K when assigning one from the other. We missed a few places.
For example, bfd_section_from_elf_index doesn't adjust for 64K. We have
to make sure all st_shndx and sh_link handlings support 64K section
correctly.


H.J.