configure.ac: Add additional warning flags.

configure.ac: Add additional warning flags.

	* configure.ac: Add additional warning flags.
	* configure: Regenerate.

	* io/write.c (calculate_G_format): Remove unused parameter.
	(output_float): Remove unused parameter.
	(write_float): Change callers.
	(nml_write_obj): Avoid signed warning.
	Make variable const to support -Wwrite-strings.

	* io/unix.c (fd_alloc, mmap_open, mmap_sfree, mem_sfree,
	mem_truncate): Mark argument as unused.

	* io/unit.c (get_unit): Mark argument as unused.
	(init_units): Avoid warning about signed comparision.

	* io/transfer.c (next_record_r): Remove unused parameter.
	(next_record_w): Remove unused parameter.
	(next_record): Change callers.
	(iolength_transfer): Mark arguments as unused.

	* io/open.c: Add initializer.

	* io/list_read.c (read_character): Mark argument as unused.
	(nml_match_name): Add const to make compile with -Wwrite-strings.

	* io/format.c: Add initializer.

From-SVN: r99839