[10/21] Fix the csect handling of XTY_ER symbols

[Nick Clifton]

Hi Richard,

> bfd/
> 	* libcoff-in.h (xcoff_section_tdata): Update commentary.
> 	* libcoff.h: Regenerate.
> 	* xcofflink.c (xcoff_link_add_symbols): Set the csect of XTY_ER
> 	symbols to bfd_und_section_ptr or bfd_abs_section_ptr, rather than
> 	the previous symbol's csect.  Treat last_symndx as an inclusive value
> 	and simplify its handling.
> 	(xcoff_mark): Treat last_symndx as an inclusive value.  Only mark
> 	symbols with the right csect.  Don't mark rsec when processing
> 	relocations against undefined or absolute sections.  
> 	(bfd_xcoff_size_dynamic_sections): Don't check the SEC_MARK flag
> 	of bfd_und_section_ptr.
> 	(xcoff_link_input_bfd): Likewise.

Approved - please apply.

Cheers
   Nick