Don't use bfd.h in binutils/elfcomm.c

Better than warning about bfd types, just don't include bfd.h and
warn against including the header again.

	* elfcomm.c: Don't include bfd.h or bucomm.h.
	(program_name): Declare.
	(process_archive_index_and_symbols): Replace bfd_boolean with int,
	and substitute FALSE and TRUE.
	(setup_archive, setup_nested_archive): Likewise.
	* elfcomm.h: Likewise.