* ar.c: Call xexit rather than exit.

	* ar.c: Call xexit rather than exit.
	(output_filename, output_file, output_bfd): New static variables.
	(remove_output): New static function.
	(main): Call xatexit (remove_output).  Call xexit rather than
	returning.
	(extract_file): Set output_filename and output_file while output
	file is open.
	(write_archive): Likewise, but use output_bfd, not output_file.
	* arsup.c: Include libiberty.h.  Call xexit rather than exit.
	* bucomm.c: Likewise.
PR 2474.