* emultempl/aix.em (export_files): Remove.

	* emultempl/aix.em (export_files): Remove.
	(import_files): Make static.
	(struct export_symbol_list): Define.
	(export_symbols): New static variable.
	(gld${EMULATION_NAME}_parse_args): Handle an initial -b option
	correctly.  Call read_file for an export file.
	(gld${EMULATION_NAME}_before_allocation): Call
	bfd_xcoff_export_symbol for each export symbol, rather than
	calling read_file for each export file.
	(gld${EMULATION_NAME}_read_file): For an export file, make the
	exported symbols undefined, and store them on the export_symbols
	list.