* som.h (som_symbol_type): Delete unwind field.

	* som.h (som_symbol_type): Delete unwind field.

	* som.c (som_write_fixups): For R_ENTRY fixups, get 32bits of
	unwind information from the addend field of the R_ENTRY, get the
	other 32bits from the addend field of the R_EXIT.
	(bfd_som_attach_unwind_info): Delete function and all references.