Add linker support for SunOS shared libraries.

	Add linker support for SunOS shared libraries.
	* sunos.c: Include bfdlink.h.  Add many new functions and
	definitions for SunOS shared library support.
	* bfd-in.h (bfd_sunos_record_link_assignment): Declare.
	(bfd_sunos_size_dynamic_sections): Declare.
	* bfd-in2.h: Rebuilt.
	* aoutx.h (struct aout_link_hash_entry): Move to libaout.h.
	(struct aout_link_hash_table): Likewise.
	(aout_link_hash_lookup, aout_link_hash_traverse): Likewise.
	(aout_hash_table): Likewise.
	(NAME(aout,link_hash_newfunc)): Rename from aout_link_hash_newfunc
	and make externally visible.
	(NAME(aout,link_hash_table_init)): New function.
	(NAME(aout,link_hash_table_create)): Call
	NAME(aout,link_hash_table_init), not _bfd_link_hash_table_init.
	(aout_link_add_symbols): Don't fail if no symbols.  If it exists,
	call add_dynamic_symbols backend entry point for dynamic objects.
	Use add_one_symbol backend entry point if it exists.
	(NAME(aout,final_link)): Call finish_dynamic_link backend entry
	point, if it exists.
	(aout_link_input_bfd): For a dynamic object, call
	link_dynamic_object backend entry point, if it exists.
	(aout_link_write_other_symbol): Call write_dynamic_symbol backend
	entry point, if it exists.
	(aout_link_input_section): Don't read the relocs if they have
	already been read.
	(aout_link_input_section_std): When doing a final link, for a
	reloc against an external symbol, call check_dynamic_reloc backend
	entry point, if it exists.
	(aout_link_input_section_ext): Likewise.
	* libaout.h: Protect against multiple inclusion.  Include
	bfdlink.h.
	(struct aout_link_hash_entry): Move in from aoutx.h.
	(struct aout_link_hash_table): Likewise.
	(aout_link_hash_lookup, aout_link_hash_traverse): Likewise.
	(aout_hash_table): Likewise.
	(struct aout_backend_data): Add fields add_dynamic_symbols,
	add_one_symbol, link_dynamic_object, write_dynamic_symbol,
	check_dynamic_reloc, and finish_dynamic_link.
	(struct aout_section_data_struct): Define new structure.
	(aout_section_data): Define new accessor macro.
	(NAME(aout,link_hash_newfunc)): Declare.
	(NAME(aout,link_hash_table_init)): Declare.
	* aoutf1.h (sunos4_aout_backend): Initialize new aout_backend_data
	fields.
	* aout-target.h (MY(backend_data)): Likewise.
	* i386aout.c (MY(backend_data)): Likewise.
	* i386mach3.c (MY(backend_data)): Likewise.
	* mipsbsd.c (MY(backend_data)): Likewise.
	* sparclynx.c (sparclynx_aout_backend): Likewise.