* elfcomm.c (setup_archive): Extract index table and symbol table

	* elfcomm.c (setup_archive): Extract index table and symbol table
	scanning code into...
	(process_archive_index_and_symbols): ... this function and add
	support for 64-bit index tables.
	* elfcomm.h (struct archive_info): Change type of index_num and
	index_array to elf_vma.
	Add 'uses_64bit_indicies' field.
	* readelf.c (process_archive): Fix support for 64-bit indicies.