* linker.c (generic_link_check_archive_element): Allocate common

	* linker.c (generic_link_check_archive_element): Allocate common
	symbol information structure.  Don't bother to check for common
	symbol size overflow.
	(_bfd_generic_link_add_one_symbol): Likewise.
	* aoutx.h (aout_link_check_ar_symbols): Likewise.
	* linker.c (generic_link_check_archive_element): Adjust references
	to common symbol information for new structure.
	(_bfd_generic_link_add_one_symbol): Likewise.
	* aoutx.h (aout_link_check_ar_symbols): Likewise.
	(aout_link_add_symbols): Likewise.
	* ecoff.c (ecoff_link_add_externals): Likewise.
	* elfcode.h (elf_link_add_object_symbols): Likewise.
	(elf_link_output_extsym): Likewise.
	* sunos.c (sunos_add_one_symbol): Likewise.