Object.m: Fix signed/unsigned warning.

	* Object.m: Fix signed/unsigned warning.
	* Protocol.m: Likewise.
	* archive.c: Always include stdlib.h.
	(objc_read_short, objc_read_unsigned_short, objc_read_int,
	objc_read_long, __objc_read_nbyte_uint, __objc_read_nbyte_ulong):
	Fix signed/unsigned warning.
	(objc_write_type, objc_read_type, objc_write_types,
	objc_read_types): Ensure ctype 8-bit safety.
	(__objc_no_write, __objc_no_read): Mark unused parameters.
	* class.c (class_table_setup): Specify void arg.
	* encoding.c (atoi, objc_sizeof_type, objc_alignof_type,
	objc_skip_typespec, objc_skip_offset,
	objc_layout_structure_next_member): Ensure ctype 8-bit safety.
	(objc_layout_structure_next_member): Ensure variables are
	initialized.
	* gc.c (__objc_generate_gc_type_description,
	class_ivar_set_gcinvisible): Mark unused parameters.
	* init.c (__objc_send_load, __objc_destroy_class_tree_node): Mark
	unused parameters.
	(__objc_init_protocols) Fix signed/unsigned warning.
	* nil_method.c (nil_method): Mark unused parameters.
	* thr.h (objc_thread_callback): Specify void arg.
	* sarray.c (sarray_new, sarray_realloc, sarray_free): Fix
	signed/unsigned warning.
	(sarray_free): Fix formatting.
	* selector.c (sel_types_match): Ensure ctype 8-bit safety.
	* sendmsg.c (__objc_init_install_dtable) Mark unused parameters.

From-SVN: r54649