Object.m (forward, [...]): Fix unused parameter warnings.

	* Object.m (forward, read, write): Fix unused parameter warnings.
	* encoding.c: Include <stdlib.h>.
	(target_flags): Mark with attribute unused.
	(atoi): Delete.
	* runtime.h (__objc_selector_max_index): Change to unsigned int.
	(__objc_generate_gc_type_description): Prototype.
	* selector.c (__objc_selector_max_index): Change to unsigned int.

From-SVN: r54884