elflink.c memory leaks

elflink.c memory leaks

Many targets leaked parts of the elf_link_hash_table.  Fix that by
making _bfd_elf_link_hash_table_init set up hash_table_free correctly,
so that targets that extend elf_link_hash_table without adding
anything that needs freeing, will use _bfd_elf_link_hash_table_free.

	* elflink.c (elf_link_add_object_symbols): Always free
	nondeflt_vers.  Don't return false without freeing.
	(_bfd_elf_link_hash_table_init): Set hash_table_free here..
	(_bfd_elf_link_hash_table_create): ..rather than here.
	(elf_link_swap_symbols_out): Don't free strtab here..
	(elf_link_add_object_symbols): ..do so here instead.  Don't
	omit freeing on some error return paths.